Battery top cover assembly, battery and electric device

Abstract

The utility model relates to battery technology field especially, more particularly to a kind of battery top cover assembly, battery and electric equipment, including pole post including first connecting part and at least two second connecting parts, and second connecting part is electrically connected with first connecting part;First connecting part includes first connecting surface, is configured as electric connection with busbar;Second connecting part includes through portion and extension, through portion is set in the side of first connecting part, and through top cover plate is connected with extension;Extension includes second connecting surface, is configured as electrically connected with the pole lug of battery cell;Second connecting surface and first connecting surface are at least partially overlapped along the projection in first direction;First insulating part is set between first connecting part and top cover plate, and between second connecting part and top cover plate.The utility model solves the problem that in relevant technology, when the connection strength of battery pole post and pole lug is enhanced, increasing pole post will cause cost and space occupancy to increase, and increasing pole lug will cause pole lug redundancy, and the risk of damage is higher.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery top cover assembly, a battery, and an electrical device. Background Technology

[0002] Current solutions for eliminating adapter plates in batteries involve directly welding the tabs and terminals of the battery cell. However, the tabs are located on the battery cell, while the terminals are located on the top cover plate; their positions typically do not correspond, resulting in misalignment. To directly connect the terminals to the tabs, existing technologies either increase the size of the terminals or lengthen the tabs.

[0003] Increasing the horizontal dimensions of the terminals increases their volume, significantly raising costs and increasing the load-bearing capacity of the top cover, while also reducing the space utilization of the module / battery. Lengthening the tabs increases redundancy, thereby increasing the risk of tabs being inserted incorrectly into the cell and of tabs tearing. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problems in the related technology that when the battery terminal and the tab are directly connected, the method of enlarging the terminal will lead to increased cost and space occupation, and the method of lengthening the tab will cause tab redundancy and high risk of damage. The present invention provides a battery top cover assembly, battery and electrical equipment.

[0005] In a first aspect, the present invention provides a battery top cover assembly, including a top cover plate, a terminal post, and a first insulating member; the terminal post includes a first connecting portion and at least two second connecting portions, the second connecting portions being electrically connected to the first connecting portions; the first connecting portion includes a first connecting surface located on the surface of the first connecting portion away from the top cover plate, and is configured to be electrically connected to a busbar; the second connecting portion includes a through portion and an extension portion, the through portion being disposed on the side of the first connecting portion, the through portion being configured to penetrate the top cover plate and connect to the extension portion; the extension portion includes a second connecting surface, the second connecting surface being the surface of the extension portion away from the first connecting portion, the second connecting surface being configured to be electrically connected to a tab of a battery cell; the projection of the second connecting surface and the first connecting surface along a first direction at least partially overlaps, wherein the first direction is a direction perpendicular to the first connecting surface; the first insulating member is disposed between the first connecting portion and the top cover plate, and between the second connecting portion and the top cover plate.

[0006] In one embodiment of this utility model, the first connecting portion is provided with two second connecting portions, and the two second connecting portions are arranged on both sides of the first connecting portion along the second direction of the top cover plate; the second direction is parallel to the first connecting surface; the top cover plate is provided with two through holes; the through portion of the second connecting portion is disposed in the corresponding through hole, and a first insulating member is provided between the through portion and the through hole.

[0007] In one embodiment of the present invention, the first insulating member is at least partially located in the gap between the through portion of the second connecting portion and the through hole, and the first insulating member extends toward the periphery of the openings at both ends of the through hole.

[0008] In one embodiment of the present invention, the through portion is configured to pass through a corresponding through hole in the first direction, the end of the through portion near the first connecting portion is bent and connected to the side of the first connecting portion; the end of the through portion away from the first connecting portion is bent and connected to the extension portion, and the second connecting surface is disposed on the side of the extension portion away from the top cover plate.

[0009] In one embodiment of the present invention, a first weak structure is provided between the through portion and the first connecting portion, one end of the first weak structure being connected to the through portion and the other end being connected to the first connecting portion; a second weak structure is provided at the position where the through portion and the extension portion are bent and connected; one end of the second weak structure is connected to the extension portion and the other end being connected to the through portion.

[0010] In one embodiment of the present invention, the first connecting portion and the second connecting portion are respectively provided with nanoporous structures on their contact surfaces with the first insulating member, and the first insulating member is at least partially embedded in the nanoporous structures.

[0011] In one embodiment of the present invention, a first step is formed on the surface edge of the first connecting portion, and the plane of the first step is flush with the first surface of the first insulating member. The first surface is the side of the first portion of the first insulating member away from the top cover plate, and the first portion is the part of the first insulating member disposed between the first connecting portion and the top cover plate. A second step is formed on the edge of the extension portion of the second connecting portion away from the through portion, and the plane of the second step is flush with the second surface of the first insulating member. The second surface is the side of the second portion of the first insulating member away from the top cover plate, and the second portion is the part of the first insulating member disposed between the through portion and the corresponding through hole, and extending from the periphery of the opening of the through hole.

[0012] In one embodiment of the present invention, the first insulating member further includes a support member; the support member is disposed between the first connecting portion and the top cover plate; the first insulating member surrounds the support member.

[0013] In one embodiment of the present invention, it further includes: a second insulating member disposed on the side of the top cover plate away from the first connecting portion; the second insulating member is provided with mounting through holes, the mounting through holes being configured to cooperate with a second portion of the first insulating member, wrapping the side of the second portion, and covering the side of the top cover plate away from the first connecting portion; the number of mounting through holes is the same as the number of second portions of the first insulating member at the through holes.

[0014] Secondly, this utility model also provides a battery, including any of the above-mentioned battery top cover assembly, a battery cell, and a housing; the battery cell is disposed in the housing, and the battery top cover assembly is fixedly mounted on the housing; the electrode tab of the battery cell is electrically connected to the second connecting surface of the battery top cover assembly.

[0015] Thirdly, this utility model also provides an electrical device, including the aforementioned battery.

[0016] In one embodiment of this utility model, the electrode post is configured with a first connecting portion and at least two second connecting portions, and the second connecting portions are electrically connected to the first connecting portion. The first connecting surface of the first connecting portion is electrically connected to the busbar. The second connecting portion includes a through portion and an extension portion. The through portion is disposed on the side of the first connecting portion, passes through the top cover plate, and connects to the extension portion. The second connecting surface of the extension portion is electrically connected to the tab of the battery cell, thereby forming a second connecting surface on the electrode post for welding to the tab. This effectively increases the contact area between the electrode post and the tab. Moreover, the projections of the second connecting surface and the first connecting surface along the first direction at least partially overlap, which not only avoids excessively increasing the projected area of ​​the electrode post on the top cover plate but also effectively ensures the connection strength between the electrode post and the tab. A first insulating member is disposed between the first connecting portion and the top cover plate, and between the second connecting portion and the top cover plate, to ensure insulation between the electrode post and the top cover plate. This solves the problems in related technologies where directly connecting the battery electrode post and the tab by enlarging the electrode post leads to increased cost and space occupation, and using an extended tab leads to tab redundancy and a high risk of damage. This provides a battery top cover assembly and a battery. Attached Figure Description

[0017] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1This is an exploded view of a top cover assembly of a battery according to an embodiment of the present invention.

[0019] Figure 2 This is a top view of the top cover assembly;

[0020] Figure 3 for Figure 2 A cross-sectional view of surface AA;

[0021] Figure 4 for Figure 3 Enlarged view of part C in the image;

[0022] Figure 5 for Figure 2 A cross-sectional view of the BB side;

[0023] Figure 6 This is a schematic diagram of the structure of the terminal post of a battery in an embodiment of this utility model;

[0024] Figure 7 for Figure 6 Top view;

[0025] Figure 8 for Figure 6 The main view.

[0026] Figure 9 This is a schematic diagram of a battery according to the present invention.

[0027] Figure 10 This is a schematic diagram of a battery pack according to the present invention.

[0028] Figure 11 This is a schematic diagram of an electrical device according to the present invention.

[0029] Explanation of reference numerals in the instruction manual:

[0030] 1. Top cover plate; 11. Through hole; 12. Recess; 2. Terminal post; 21. First connecting part; 22. Second connecting part; 221. Through part; 222. Extension part; 231. First connecting surface; 232. Second connecting surface; 3. First insulating component; 31. Injection molded part; 32. Support component; 4. Second insulating component; 41. Mounting through hole; 42. Boss structure; 5. Injection hole; 6. Explosion-proof valve; 61. Explosion-proof valve through hole; 62. Explosion-proof valve protective plate; 71. First weak structure; 72. Second weak structure; 81. First step; 82. Second step; 9. Battery; 91. Battery pack; 92. Electrical equipment. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0032] In related technologies, to simplify the connection structure between the terminal block and the tab, and to reduce the thickness of the top cover assembly, the adapter plate can be eliminated, and the terminal block and tab can be directly connected. However, the positions of the terminal block and the tab are often misaligned, which requires increasing the size of the terminal block or lengthening the tab, but this will create new problems. Increasing the size of the terminal block will increase the pressure on the tab, and lengthening the tab will increase the risk of tab breakage, both of which are detrimental to the stability and safety requirements of the battery.

[0033] Therefore, this embodiment provides a battery top cover assembly, referring to... Figures 1 to 8 As shown, the battery top cover assembly of this utility model includes: a top cover plate 1, a terminal post 2, and a first insulating member 3. The terminal post 2 features a novel structure that increases the connection area between the terminal post 2 and the tab without significantly increasing the weight of the terminal post 2, thereby ensuring an effective connection between the terminal post 2 and the tab.

[0034] Specifically, the electrode post 2 includes a first connecting portion 21 and at least two second connecting portions 22, which are electrically connected to the first connecting portion 21. The first connecting portion 21 is the part located above the top cover plate 1, and its main function is to be electrically connected to the busbar. The at least two second connecting portions 22 are electrically connected to the first connecting portion 21 and penetrate through the top cover plate 1, connecting to the electrode tab on the side of the top cover plate 1 opposite to the first connecting portion 21.

[0035] The second connecting part 22 is set to at least two, mainly because if there is only one second connecting part 22, in order to ensure the stability of the first connecting part 21, it needs to be set in the center of the first connecting part 21, forming a pole post 2 with a large difference in size between the two ends and the middle. This will result in insufficient strength of the pole post 2, which is prone to breakage.

[0036] By providing at least two second connecting parts 22, the first connecting part 21 can be supported from at least two directions. This not only reduces the size of the second connecting parts 22 and the size of the through hole 11 on the top cover plate 1, thus preventing a decrease in the strength of the top cover plate 1, but also enhances the overall strength of the pole post 2, preventing the pole post 2 from deforming and breaking.

[0037] The first connecting portion 21 includes a first connecting surface 231, which is located on the surface of the first connecting portion 21 away from the top cover plate 1 and is configured to be electrically connected to the busbar. It should be noted that the busbar is a metal conductive component used to connect the electrodes of the batteries in series or parallel when the batteries are used in a group. Here, the first connecting portion 21 is used for electrical connection to the busbar, but this should not be interpreted as meaning that it must be connected to the busbar during use; in some scenarios, the battery can also be used independently.

[0038] The second connecting part 22 includes a through part 221 and an extension part 222. The through part 221 is provided on the side of the first connecting part 21, extends out from the side of the first connecting part 21, is then bent, passes through the top cover plate 1, and connects with the extension part 222.

[0039] like Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the first connecting part 21 is arranged parallel to the top cover plate 1. The second connecting part 22 is first led out from the side of the first connecting part 21, bent and passed through the top cover plate 1, and then connected to the extension part 222. Thus, the through part 221 and the extension part 222 of the second connecting part 22 are C-shaped as a whole.

[0040] The aforementioned extension 222 includes a second connecting surface 232, which is the surface of the extension 222 away from the first connecting portion 21. The second connecting surface 232 is configured to be electrically connected to the electrode tab of the battery cell. The second connecting surface 232 formed by the extension 222 provides a welding plane for welding with the electrode tab, thus not reducing the connection strength between the electrode post 2 and the electrode tab. This avoids the problem that the electrode post portion passing through the top cover plate 1 is too small due to the through hole of the top cover plate 1, resulting in low connection strength with the electrode tab.

[0041] The projections of the second connecting surface 232 and the first connecting surface 231 along the first direction at least partially overlap, wherein the first direction is the direction perpendicular to the first connecting surface 231. This allows the second connecting surface 232 and the first connecting surface 231 to form the two end faces of the pole post 2 without causing large misalignment, thus preventing the pole post 2 from having low overall strength and being prone to breakage and failure during use.

[0042] After the shape of the pole post 2 is changed, the first insulating component 3 also needs to be changed accordingly to ensure insulation between the pole post 2 and the top cover plate 1. The first insulating component 3 is disposed between the first connecting part 21 and the top cover plate 1, and between the second connecting part 22 and the top cover plate 1. It should be noted that the first insulating component 3 can be disposed separately or integrally molded.

[0043] In this embodiment, since the pole post 2 has a complex shape and there are many parts that need to be insulated from the top cover plate 1, it is preferable to integrally injection mold the first insulating part 3.

[0044] With the above-described structure, the pole post 2 forms a second connecting surface 232 in its extension 222, which is conductively connected to the electrode tab of the battery cell. This effectively increases the contact area between the pole post 2 and the electrode tab. Moreover, the projection of the second connecting surface 232 and the first connecting surface 231 along the first direction at least partially overlaps. This not only avoids excessively increasing the projection area of ​​the pole post 2 on the top cover plate 1, but also effectively ensures the connection strength between the pole post 2 and the electrode tab.

[0045] This solves the problems in related technologies where directly connecting the battery terminal 2 to the tab results in increased cost and space occupation when using a larger terminal, and causes tab redundancy and high risk of damage when using a longer tab. This provides a battery top cover assembly and a battery.

[0046] As an alternative, the first connecting part 21 is provided with two second connecting parts 22, which are arranged on both sides of the first connecting part 21 along the second direction of the top cover plate 1; the second direction is parallel to the first connecting surface 231.

[0047] like Figures 1 to 5 As shown, along the width direction of the top cover plate 1, two second connecting portions 22 are provided on both sides of the first connecting portion 21. The aforementioned second direction can be either the width direction or the length direction.

[0048] However, since the width of the top cover plate 1 is not much different from the size of the pole post 2, and the pole post 2 and the pole lug are also misaligned in the length direction of the top cover plate 1 and there is a certain distance between them, it is generally considered that the size of the top cover plate 1 is taken into account, and two second connecting parts 22 are provided along the width direction of the top cover plate 1. In this way, the size of the pole post 2 in the width direction is fixed, and extending the size in the length direction will not affect the overall strength.

[0049] Correspondingly, two through holes 11 are provided on the top cover plate 1; the through portion 221 of the second connecting portion 22 is provided in the corresponding through hole 11, and a first insulating member 3 is provided between the through portion 221 and the through hole 11. The first insulating member 3 here can be understood as part of the integrally injection molded first insulating member 3, the main purpose of which is to ensure the insulation between the through portion 221 and the through hole 11.

[0050] As an alternative, the first insulating member 3 is at least partially located in the gap between the through portion 221 of the second connecting portion 22 and the through hole 11, and the first insulating member 3 extends toward the periphery of the opening at both ends of the through hole 11.

[0051] like Figure 5 As shown, the first insulating member 3 needs to be at least within the gap between the through portion 221 and the inner wall of the through hole 11 to ensure insulation between the through portion 221 and the through hole 11. At both ends of the through hole 11, the first insulating member 3 extends towards the periphery of the opening, mainly to fix the first insulating member 3 to the through hole 11. Moreover, extending to the opening can increase the size of the first insulating member 3, preventing creepage between the pole post 2 and the top cover plate 1 that could lead to leakage.

[0052] As an alternative, the through portion 221 is configured to pass through the corresponding through hole 11 in a first direction. The end of the through portion 221 near the first connecting portion 21 is bent and connected to the side of the first connecting portion 21. The end of the through portion 221 away from the first connecting portion 21 is bent and connected to the extension portion 222. The second connecting surface 232 is provided on the side of the extension portion 222 away from the top cover plate 1.

[0053] like Figure 1 and Figure 5 As shown, the first connecting portion 21 is arranged along a direction parallel to the top cover plate 1 and perpendicular to a first direction, which is the thickness direction of the top cover plate 1. Thus, the end of the through portion 221 of the second connecting portion 22 near the first connecting portion 21 needs to be bent and connected to the side of the first connecting portion 21.

[0054] The first connecting portion 21 and the second connecting portion 22 can be integrally formed. The through portion 221 and the extension portion 222 of the second connecting portion 22 can also be integrally formed. This means that the end of the through portion 221 away from the first connecting portion 21 is bent and connected to the extension portion 222.

[0055] like Figures 6 to 8 As shown, this is the structure of the pole post 2 before installation. During installation, the through portion 221 and the first connecting portion 21 need to be bent 90 degrees and inserted into the through hole 11, with the extension portion 222 completely placed on the other side of the top cover plate 1. Then, the extension portion 222 and the through portion 221 are bent 90 degrees, and the second connecting surface 232 is parallel to the top cover plate 1. The pole post 2 has different states before and after installation. Weak structures, such as grooves and notches, are provided where bending is required to facilitate bending.

[0056] As an alternative, a first weak structure 71 is provided between the through portion 221 and the first connecting portion 21. One end of the first weak structure 71 is connected to the through portion 221, and the other end of the first weak structure 71 is connected to the first connecting portion 21. A second weak structure 72 is provided at the bend connection between the through portion 221 and the extension portion 222. One end of the second weak structure 72 is connected to the extension portion 222, and the other end of the second weak structure 72 is connected to the through portion 221.

[0057] Specifically, a first weak structure 71 is provided between the through portion 221 and the first connecting portion 21. The first weak structure 71 can be a groove, scratch, etc. In this embodiment, a groove is used to facilitate processing and manufacturing and to avoid deformation due to material compression during bending. The first weak structure 71 can be set on the inner or outer side of the bend, preferably on the inner side, where the material is subjected to more severe compression. The first weak structure 71 can be set on one side inside the bend between the through portion 221 and the first connecting portion 21. That is, the side of the through portion 221 that faces away from the first connecting surface 231.

[0058] One end of the aforementioned first weak structure 71 is connected to the through portion 221, and the other end is connected to the first connecting portion 21. That is, the first weak structure 71 is used to connect the through portion 221 and the first connecting portion 21, and its main function is to facilitate the bending of the through portion 221 relative to the first connecting portion 21.

[0059] Similarly, a second weak structure 72 is provided at the bend where the through portion 221 and the extension portion 222 are connected. The second weak structure 72 is similar to the first weak structure 71 and can also be a groove.

[0060] The second weak structure 72 is connected at one end to the extension 222 and at the other end to the through portion 221. That is, the second weak structure 72 is used to connect the through portion 221 and the extension 222, and its main function is to allow the through portion 221 to bend relative to the extension 222.

[0061] As an alternative, the first connecting part 21 and the second connecting part 22 are respectively provided with nanoporous structures on the contact surfaces with the first insulating member 3, and the first insulating member 3 is at least partially embedded in the nanoporous structure.

[0062] The aforementioned nanoporous structure can be achieved through nano-injection molding, which refers to forming nanoporous pores by etching the surfaces of the top cover plate 1 and the pole post 2 with an etchant. The injection molded part 31 is embedded in the nanoporous pores. Compared with traditional injection molding, nano-injection molding has better sealing performance and better connection strength, and can also replace sealing rings.

[0063] As an alternative, a first step 81 is provided on the surface edge of the first connecting part 21. The plane of the first step 81 is flush with the first surface of the first insulating member 3. The first surface is the side of the first part of the first insulating member 3 away from the top cover plate 1. The first part is the part of the first insulating member 3 disposed between the first connecting part 21 and the top cover plate 1.

[0064] The main function of the first insulating element 3 is to insulate the pole post 2 from the top cover plate 1, such as... Figure 4 and Figure 5 As shown, at the first connecting part 21, the part that needs to be insulated from the top cover plate 1 is mainly the gap between the first connecting part 21 and the top cover plate 1. However, the through part 221, which is connected to the side of the first connecting part 21, not only penetrates the through hole 11 on the top cover plate 1 but also extends above the surface of the top cover plate 1. Therefore, during insulation, it is necessary to insulate both the gap between the through part 221 and the surface of the top cover plate 1 and the gap between the through part 221 and the through hole.

[0065] Based on the insulating position of the first connecting part 21, the portion of the through part 221 outside the surface of the top cover plate 1 needs to be completely wrapped, thereby effectively wrapping the side of the first connecting part 21. A first step 81 is formed at the edge of the surface of the first connecting part 21, and the plane of the first step 81 is flush with the first surface of the first insulating member 3, which can prevent glue overflow during injection molding. On the one hand, it avoids leakage of the through part 221 and completely exposes the first connecting surface 231; on the other hand, it also increases the strength of the injection molded part 31 obtained by injection molding the first insulating member 3.

[0066] The aforementioned first surface is the side of the first portion of the first insulating member 3 that is away from the top cover plate 1. The first portion is the part of the first insulating member 3 disposed between the first connecting portion 21 and the top cover plate 1. In fact, the first portion also includes the insulating portion between the through portion 221 and the top cover plate 1, but the definition of the first portion here is only to indicate the position of the first surface and the partial structure of the first insulating member 3 represented by the first surface.

[0067] like Figure 4 and Figure 5 As shown, there are at least two steps between the first connecting surface 231 of the first connecting part 21 and the surface of the through part 221. The platform plane closest to the first connecting surface 231 is parallel to the first surface of the first insulating component 3. The height difference L5 between the platform plane and the first connecting surface is ≥0.2mm, and the width L6 of the platform plane is ≥0.5mm.

[0068] Similarly, a second step 82 can also be provided on the edge of the extension 222 of the second connecting part 22 away from the through part 221. The plane of the second step 82 is flush with the second surface of the first insulating member 3. On the one hand, it is to expose the second connecting surface 232, and on the other hand, the vertical surface of the second step 82 can form a block, which can facilitate the injection molding of the first insulating member 3.

[0069] Similar to the first surface, the second surface is the side of the second part of the first insulating member 3 away from the top cover plate 1. The second part is the portion of the first insulating member 3 disposed between the through portion 221 and the corresponding through hole 11, and extending from the periphery of the opening of the through hole 11.

[0070] It should be noted that, since the thickness of the extension 222 after bending can also form a stepped structure-like function, the second surface of the first insulating member 3 can also be set to be flush with the side of the extension 222 near the top cover plate 1, such as... Figure 5 As shown.

[0071] As an alternative, the first insulating member 3 also includes a support member 32; the support member 32 is disposed between the first connecting portion 21 and the top cover plate 1; the first insulating member 3 surrounds the support member 32.

[0072] Since neither the first connecting portion 21 nor the second connecting portion 22 of the pole post 2 directly contacts the top cover plate 1, but in actual installation, the pole post 2 needs to be installed first before the injection molding of the first insulating component 3, and the pole post 2 is movable relative to the top cover plate 1, this is not conducive to the injection molding of the first insulating component 3. Therefore, when injection molding the first insulating component 3, a support member 32 can be provided between the first connecting portion 21 and the top cover plate 1. After the first insulating component 3 is injection molded, it wraps around the support member 32 to ensure insulation between the first connecting portion 21 and the top cover plate 1.

[0073] The aforementioned support member 32 can be a support block made of insulating solid material, such as a ceramic block, glass block, resin block, rubber block, etc. Preferably, this embodiment selects a ceramic block, which can withstand high temperatures during the injection molding process and provide stable support for the first connection part 21. It should be noted that in order to improve the connection strength between the ceramic block and the first insulating member 3, a nanoporous structure can be formed on the surface of the ceramic block.

[0074] The distance between the first connecting part 21 and the top cover plate 1 is 0.3mm≤A2≤3mm.

[0075] As an optional solution, it also includes: a second insulating member 4, which is disposed on the side of the top cover plate 1 away from the first connecting part 21; the second insulating member 4 is provided with a mounting through hole 41, which is configured to cooperate with the second part of the first insulating member 3, wrap around the side of the second part, and cover the side of the top cover plate 1 away from the first connecting part 21; the number of mounting through holes 41 is the same as the number of the second part of the first insulating member 3 at the through hole 11.

[0076] like Figure 4 and Figure 5 As shown, the second insulating member 4 is disposed on the side of the top cover plate 1 away from the first connecting part 21. Its main function is to insulate the battery cell and electrolyte inside the top cover plate 1 from the top cover plate 1. To ensure the insulation of the top cover plate 1, the second insulating member 4 is combined with the first insulating member 3 to form complete insulation for the top cover plate 1.

[0077] The through hole 11 of the top cover plate 1 can pass through the extension 222 and the through portion 221, and the single-sided distance A1 between the through portion 221 and the inner wall of the through hole 11 is greater than 0.3 mm.

[0078] During the assembly of the top cover assembly, the second insulating component 4 needs to be installed on the top cover plate 1 first, then the pole post 2 is installed, and then the first insulating component 3 is injection molded. Therefore, the second insulating component 4 needs to be provided with mounting through holes 41 to allow the through portion 221 to pass through the top cover plate 1. The mounting through holes 41 can correspond to the through holes 11, and the number of mounting through holes 41 is the same as the number of the second part of the first insulating component 3 at the through holes 11.

[0079] Alternatively, a single, larger mounting through-hole 41 can be provided to accommodate the entire area of ​​all through holes 11. During injection molding of the first insulating component 3, the surface of the top cover plate 1 exposed inwards within the area of ​​the mounting through-hole 41 is covered. Specifically, during injection molding, when covering the surface of the top cover plate 1 opposite to the first connecting portion 21, the thickness of the injection-molded first insulating component 3 can be equal to the thickness of the second insulating component 4 to ensure consistent insulation strength with the second insulating component 4.

[0080] like Figure 6 , Figure 7 and Figure 8 As shown, the pole 2 is in the state before installation. Based on this, this embodiment also provides a pole, including an integrally formed first connecting part 21 and at least two second connecting parts 22. The first connecting part 21 and the second connecting part 22 are both made of conductive materials. The second connecting part 22 can be bent to connect with the first connecting part 21. The first connecting part 21 includes a first connecting surface 231, which is located on the surface of the first connecting part 21 away from the top cover plate 1 and is configured to be electrically connected to the busbar.

[0081] The second connecting part 22 includes a through part 221 and an extension part 222. The through part 221 and the extension part 222 are bendably connected. The through part 221 is disposed on the side of the first connecting part 21. The through part 221 is configured to penetrate the top cover plate 1 and connect with the extension part 222.

[0082] The extension 222 includes a second connecting surface 232, which is configured to be electrically connected to the electrode tab of the battery cell. The second connecting surface 232 and the first connecting surface 231 are on the same side.

[0083] As an optional solution, a first weak structure 71, specifically a groove, is provided at the connection point between the through portion 221 and the first connecting portion 21. The groove is formed on the side of the through portion 221 facing away from the first connecting surface 231. The length L7 and depth L8 of the groove satisfy: L7 > L8 = (0.1~0.8)L2, where L2 is the thickness of the through portion 221 of the second connecting portion 22. The groove can be distributed on the inside or outside of the bend, preferably on the inside of the bend.

[0084] As an alternative, a second weak structure 72 is provided at the junction of the through portion 221 and the extension portion 222. Specifically, it can be a groove, which is formed on the same side of the extension portion 222 and the first connecting surface 231. The length L9 and depth L10 of the groove satisfy: L9 > L10 = (0.1~0.8)L2. The groove can also be distributed on the inside or outside of the bend, preferably on the outside of the bend.

[0085] In addition, a step is further provided on the outside of the extension part 222, where the width of the step plane of the step L11 satisfies L11 ≥ 0.5 mm, and the height L12 of the step satisfies L12 = L10 ≥ 0.2 mm, and L10 is the groove depth of the second weak structure 72.

[0086] It is preferable that the groove of the second weak structure 72 is provided on the bending outer side. After bending, the step of the extension part 222 enables the extension part 222 to form a flat surface more easily, thereby occupying less space and allowing the extension part 222 to have a larger area.

[0087] As shown in Figure 7 and Figure 8 , as an optional solution, the thickness of the pole main body, that is, the thickness L1 of the first connecting part 21 satisfies 1 mm ≤ L1 ≤ 5 mm, the thickness L2 of the through part 221 of the second connecting part 22 satisfies L2 < L1, and the thickness L3 of the extension part 222 satisfies L3 < L1.

[0088] The thickness L4 of the pole base material used for manufacturing the pole 2 satisfies L4 ≥ max(L1, L2, L3).

[0089] In the arrangement direction of the second connecting part 22, the dimension of the first connecting part 21 accounts for [50%, 100%) of the overall dimension of the pole, preferably [80%, 100%), so as to ensure the flow area of the first connecting part 21.

[0090] Based on this, the assembly process of the pole 2 is as follows: after bending, the two second connecting parts 22 of the pole are inserted into the through hole 11, after bending the extension part 222 inward, molten plastic is injected into the gap between the pole 2 and the top cover plate 1 to form the first insulating member 3.

[0091] The situation where a ceramic support is provided: before injection molding, the ceramic support is arranged between the pole 2 and the top cover plate 1, and positioning is performed by the ceramic support, so as to prevent the pole 2 from having no support during injection molding and being prone to collapsing.

[0092] The second insulating member 4 is fixed on the side of the top cover plate 1 where the extension part is arranged. The second insulating member 4 is a pre-processed molded part, and the extension part 222 passes through the mounting through hole 41 of the second insulating member 4.

[0093] The pole lug of the cell is welded to the second connecting surface 232 of the extension part 222, the top cover assembly and the connected cell are put into the housing, and then the top cover plate 1 is welded and sealed with the housing.

[0094] In a second aspect, as Figure 9As shown, this utility model also provides a battery 9, including any of the above-described battery top cover assembly, a battery cell, and a housing; the battery cell is disposed within the housing, and the battery top cover assembly is fixedly mounted on the housing; the electrode tabs of the battery cell are electrically connected to the second connecting surface of the battery top cover assembly. Multiple batteries 9 are connected in series or in parallel to form a battery pack 91 to supply power to electrical devices.

[0095] Thirdly, this utility model also provides an electrical device 92, including the aforementioned battery 9. For example... Figure 11 As shown, the electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. As an example, the electrical device 92 is a vehicle, and the vehicle has a battery 9 installed inside. The battery 9 can directly supply power to the electrical device 92, or it can form a battery pack 91 to supply power to the electrical device 92.

[0096] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A battery top cover assembly, characterized in that, include: Top cover plate (1), pole post (2), first insulating component (3); The pole post (2) includes a first connecting part (21) and at least two second connecting parts (22), and at least two second connecting parts (22) are connected to the first connecting part (21); The first connecting portion (21) includes a first connecting surface (231), which is located on the side of the first connecting portion (21) away from the top cover plate (1) and is configured to be electrically connected to an electrical connector; The second connecting portion (22) includes a through portion (221) and an extension portion (222) that are connected to each other. The through portion (221) is disposed on the side of the first connecting portion (21) and the through portion (221) is configured to penetrate the top cover plate (1). The extension (222) includes a second connecting surface (232), which is the surface of the extension (222) away from the first connecting portion (21). The second connecting surface (232) is configured to be conductively connected to the tab of the battery cell. The projection of the second connecting surface (232) onto the first connecting surface (231) in a first direction at least partially overlaps, wherein the first direction is perpendicular to the first connecting surface (231). The first insulating member (3) is disposed between the first connecting part (21) and the top cover plate (1), and between the second connecting part (22) and the top cover plate (1).

2. The battery top cover assembly according to claim 1, characterized in that, The first connecting part (21) is provided with two second connecting parts (22), and the two second connecting parts (22) are arranged on both sides of the first connecting part (21) along the second direction of the top cover plate (1); the second direction is parallel to the first connecting surface (231); The top cover plate (1) is provided with two through holes (11); the through part (221) of the second connecting part (22) is provided in the corresponding through hole (11), and a first insulating member (3) is provided between the through part (221) and the through hole (11).

3. The battery top cover assembly according to claim 2, characterized in that, The first insulating member (3) is at least partially located in the gap between the through portion (221) of the second connecting portion (22) and the through hole (11), and the first insulating member (3) extends toward the periphery of the openings at both ends of the through hole (11).

4. The battery top cover assembly according to claim 1, characterized in that, The through portion (221) is configured to pass through the corresponding through hole (11) in the first direction. The end of the through portion (221) near the first connecting portion (21) is bent and connected to the side of the first connecting portion (21). The end of the through portion (221) away from the first connecting portion (21) is bent and connected to the extension portion (222), and the second connecting surface (232) is disposed on the side of the extension portion (222) away from the top cover plate (1).

5. The battery top cover assembly according to claim 4, characterized in that, A first weak structure (71) is provided between the through portion (221) and the first connecting portion (21), one end of the first weak structure (71) being connected to the through portion (221) and the other end being connected to the first connecting portion (21); and / or, A second weak structure (72) is provided at the position where the through portion (221) and the extension portion (222) are bent and connected; one end of the second weak structure (72) is connected to the extension portion (222), and the other end is connected to the through portion (221).

6. The battery top cover assembly according to claim 1, characterized in that, The first connecting part (21) and the second connecting part (22) are respectively provided with nanoporous structures on the contact surfaces with the first insulating member (3), and the first insulating member (3) is at least partially embedded in the nanoporous structure.

7. The battery top cover assembly according to claim 1, characterized in that, The first connecting portion (21) has a first step (81) on its surface edge. The plane of the first step (81) is flush with the first surface of the first insulating member (3). The first surface is the side of the first portion of the first insulating member (3) away from the top cover plate (1). The first portion is the part of the first insulating member (3) located between the first connecting portion (21) and the top cover plate (1). And / or, The extension (222) of the second connecting part (22) has a second step (82) at one end away from the through part (221). The plane of the second step (82) is flush with the second surface of the first insulating member (3). The second surface is the side of the second part of the first insulating member (3) away from the top cover plate (1). The second part is the part of the first insulating member (3) that is disposed between the through part (221) and the corresponding through hole (11) and extends from the periphery of the opening of the through hole (11).

8. The battery top cover assembly according to claim 1, characterized in that, It also includes support components (32); The support member (32) is disposed between the first connecting part (21) and the top cover plate (1); The first insulating element (3) surrounds the support element (32); and / or, It also includes: a second insulating member (4), which is disposed on the side of the top cover plate (1) away from the first connecting part (21); The second insulating member (4) is provided with a mounting through hole (41), which is configured to cooperate with the second part of the first insulating member (3), wrap the side of the second part, and cover the side of the top cover plate (1) away from the first connecting part (21); The number of mounting through holes (41) is the same as the number of the second portion of the first insulating element (3) at the through hole (11).

9. A battery, characterized in that, Includes a battery top cover assembly as described in any one of claims 1 to 8, a battery cell, and a housing; The battery cell is disposed inside the housing, and the battery top cover assembly is fixedly mounted on the housing; The electrode tab of the battery cell is connected to the second connecting surface of the battery top cover assembly.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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