Top cover assembly, battery, battery pack and electric device

Abstract

The utility model relates to a top cover assembly, a battery, a battery pack and an electric device. The top cover assembly comprises a pole element, an embedded plate, a cover plate, an insulating sealing cover and a fixing piece which are sequentially stacked in the first direction, the pole element comprises a pole, the pole penetrates through the embedded plate, the cover plate, the insulating sealing cover and the fixing piece, and the pole is fixed to the fixing piece; the cover plate is provided with liquid injection holes, and the liquid injection holes and the pole columns are arranged at intervals; the insulation sealing cover comprises a wrinkle structure, the wrinkle structure surrounds the outer side of the pole, and at least part of the wrinkle structure is located between the pole and the liquid injection hole. The top cover assembly is beneficial to avoiding conduction between the pole and the shell.

Description

Technical Field

[0001] The present disclosure relates to the field of new energy technologies, and particularly to a top cover assembly, a battery, a battery pack, and an electrical device. Background Art

[0002] Blade-shaped battery cells have a certain market share due to their high energy density at the system level. In recent years, the continuous breakthrough of fast charging technology has made high-voltage systems more and more popular. The safety issue of high-voltage systems has always been the focus of R & D personnel in various enterprises, and whether the top cover of the battery cell is charged has a strong correlation with system safety. Although charging the top cover can maintain the electric potential of the housing at a relatively high value, far exceeding the aluminum shell corrosion potential, which can avoid electrochemical corrosion of the aluminum shell to a certain extent. However, charging the top cover poses a very big challenge to the safety of high-voltage systems with voltages reaching several hundred volts. Once the insulation fails, a large current passes through the plastic on the top cover to generate heat, which is likely to catch fire and ultimately lead to thermal runaway.

[0003] To avoid this risk, the battery cell is designed to change from a charged top cover to an uncharged top cover, that is, a neutral cover plate, and the resistance of the plastic on it is generally above 200 MΩ. In this way, the safety risk at the system level is greatly reduced. The neutral cover plate battery cell improves the safety at the system level, but also introduces other process problems. During the formation and liquid injection processes of the battery cell, drawing a negative pressure will cause a part of the electrolyte to overflow to the outside of the battery cell, and the overflowing electrolyte will flow along the light aluminum sheet to the pole column, resulting in ionic conduction between the pole column and the aluminum shell, thereby lowering the aluminum shell potential and causing batch side voltage defects. If these defects coexist with the electronic conduction between the negative electrode and the housing inside the battery cell, it is very difficult to determine whether it is a qualified product at the production site. The above-mentioned side voltage defects lead to a high defective rate on the production line, increase the difficulty of judging whether the shipped battery cells are qualified, and have a great impact on the normal operation of the production line, and also cause a large amount of scrapping. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a top cover assembly, a battery, a battery pack, and an electrical device for the problem of ionic conduction caused by electrolyte overflow.

[0005] An embodiment of the present disclosure provides a top cover assembly, which includes: a pole column element, an embedded plate, a cover plate, an insulating cover, and a fixing member stacked in sequence along a first direction; the pole column element includes a pole column, the pole column penetrates through the embedded plate, the cover plate, the insulating cover, and the fixing member, and the pole column is fixed to the fixing member; the cover plate is provided with a liquid injection hole, and the liquid injection hole is spaced from the pole column; the insulating cover includes a corrugated structure, and the corrugated structure surrounds the outside of the pole column, wherein at least part of the corrugated structure is located between the pole column and the liquid injection hole.

[0006] By providing a corrugated structure, it is beneficial to block the electrolyte leaking from the liquid injection hole and prevent the electrolyte from flowing to the terminal post. The top cover assembly according to the embodiments of the present disclosure helps to prevent the terminal post from being electrically connected to the housing.

[0007] In some embodiments, the corrugated structure has at least one receiving cavity, the receiving cavity faces away from the terminal post, and at least one receiving cavity is located between the terminal post and the liquid injection hole.

[0008] With such an arrangement, in addition to adsorbing the electrolyte with a large surface area, the corrugated structure can also hold the electrolyte.

[0009] In some embodiments, there are multiple receiving cavities, and the multiple receiving cavities are arranged at intervals along the circumferential direction of the insulating cover.

[0010] With such an arrangement, the electrolyte can be held, and the laterally diffused electrolyte can also be held.

[0011] In some embodiments, the contour of the receiving cavity in the cross-section in the first direction is polygonal or arc-shaped.

[0012] With such an arrangement, while holding the electrolyte, the contact area is ensured.

[0013] In some embodiments, the corrugated structure includes a first corrugated edge, a second corrugated edge, and a corner portion; the first corrugated edge is located between the terminal post and the liquid injection hole, the second corrugated edge is connected to the first corrugated edge through the corner portion, and the outer side surface of the corner portion is an arc surface.

[0014] With such an arrangement, the second corrugated edge can block more electrolyte and more reliably prevent the electrolyte from flowing to the orifice plate.

[0015] In some embodiments, the insulating cover further includes an orifice plate and a flange, the orifice plate is provided with a terminal post through-hole, the flange surrounds the orifice plate, the corrugated structure surrounds the outside of the flange, and the flange protrudes from the corrugated structure in a direction away from the cover plate.

[0016] With such an arrangement, the insulating cover can cooperate with the terminal post to better enclose the terminal post, and the flange and the corrugated structure achieve two-stage protection. The flange can further block the electrolyte that has passed over the corrugated structure, and the effect of blocking the electrolyte is good.

[0017] In some embodiments, the flange includes a frame body and a flanging, the frame body surrounds the orifice plate, and the flanging surrounds the frame body; the flanging is spaced from the corrugated structure in a direction away from the cover plate.

[0018] With such an arrangement, the flanging can play a certain role in blocking the electrolyte flowing along the frame body, and the flange can better prevent the electrolyte from flowing to the orifice plate.

[0019] In some embodiments, there is a receiving groove between the frame body and the corrugated structure.

[0020] Such a setting is conducive to blocking the electrolyte and can utilize the receiving groove to retain the electrolyte.

[0021] In some embodiments, the dimension H of the flange in the first direction 1 and the dimension H of the corrugated structure in the first direction 2 satisfy: H 1 / 2 < H 2 < 2H 1 / 3.

[0022] With such a setting, the flange and the corrugated structure achieve a good fit; the structure of the top cover assembly is balanced and compact, ensuring the ability of the corrugated structure to block the electrolyte and also ensuring the effective functioning of the flange.

[0023] In some embodiments, the dimension H of the flange in the first direction 1 satisfies H 1 ≤ 20 mm.

[0024] With such a setting, the structure of the top cover assembly is compact.

[0025] Exemplarily, the liquid injection hole and the pole column are spaced apart in the second direction. In the third direction perpendicular to the first direction and perpendicular to the second direction, the dimension W of the flange 1 satisfies W 1 ≤ 50 mm; the corrugated structure has at least one receiving cavity with a cross-sectional profile in the shape of an arc, and the diameter R of the receiving cavity satisfies: R < W 1 .

[0026] With such a setting, the structure of the top cover assembly is compact; it can effectively block and retain the electrolyte flowing towards the orifice plate.

[0027] Embodiments of the present disclosure also provide a battery, which includes: an electric core; and the aforementioned top cover assembly, which is installed on the electric core, and the liquid injection hole is communicated with the electric core.

[0028] By setting the aforementioned top cover assembly, the production yield of this battery is high. The battery is reliable in use.

[0029] Embodiments of the present disclosure also provide a battery pack, which includes at least one of the aforementioned batteries.

[0030] The battery pack of the embodiments of the present disclosure can supply power externally, is reliable in use, and has a low risk of overheating.

[0031] Embodiments of the present disclosure also provide an electrical device, which includes: an electrical component; and the aforementioned battery, which is electrically connected to the electrical component.

[0032] By setting the battery, the electrical component can operate. This electrical device is reliable in use. Description of the Drawings

[0033] Figure 1 Schematic exploded view of the top cover assembly according to the embodiments of the present disclosure;

[0034] Figure 2 Schematic axonometric view of the top cover assembly according to the embodiments of the present disclosure;

[0035] Figure 3 Schematic top view of the top cover assembly according to the embodiments of the present disclosure;

[0036] Figure 4 Schematic structural view of the top cover assembly according to the embodiments of the present disclosure;

[0037] Figure 5 is Figure 4 Enlarged view of area A in

[0038] Figure 6 Schematic structural view of the insulating cover according to the embodiments of the present disclosure;

[0039] Figure 7 Schematic axonometric view of the top cover assembly according to the embodiments of the present disclosure;

[0040] Figure 8 Schematic structural view of the insulating cover according to the embodiments of the present disclosure;

[0041] Figure 9 Schematic structural view of the insulating cover according to the embodiments of the present disclosure;

[0042] Figure 10 Schematic structural view of the battery according to the embodiments of the present disclosure;

[0043] Figure 11 Schematic structural block diagram of the electrical device according to the embodiments of the present disclosure.

[0044] Explanation of reference numerals: 1, cover plate; 101, liquid injection hole; 102, pole column assembly hole;

[0045] 2, insulating cover; 20, corrugated structure; 21, perforated plate; 211, pole column through hole; 22, flange; 221, frame body; 222, flanging; 23, first corrugated edge; 231, spacer block; 24, corner part; 25, second corrugated edge; 201, accommodation cavity; 202, accommodation groove;

[0046] 3, insert panel; 31, liquid injection cavity; 4, fixing member; 5, sealing ring; 6, pole column element; 61, pole column; 62, electrode plate;

[0047] 100, top cover assembly; 200, battery; 300, battery cell; 400, battery pack; 500, electrical appliance; 1000, electrical device. Detailed embodiments

[0048] In order to make the above - mentioned objects, features and advantages of the embodiments of the present disclosure more obvious and understandable, the following will describe in detail the specific embodiments of the embodiments of the present disclosure with reference to the accompanying drawings. A lot of specific details are set forth in the following description in order to fully understand the embodiments of the present disclosure. However, the embodiments of the present disclosure can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the embodiments of the present disclosure. Therefore, the embodiments of the present disclosure are not limited by the specific embodiments disclosed below.

[0049] In the description of the embodiments of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present disclosure.

[0050] In the embodiments of the present disclosure, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0051] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Exemplarily, the first frilled edge may also be referred to as the second frilled edge, and the second frilled edge may also be referred to as the first frilled edge. In the description of the embodiments of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In the embodiments of the present disclosure, unless otherwise clearly specified or limited, terms such as "connected" and "coupled" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a flexible connection, or a rigid connection along at least one direction; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be an intermediate medium while being directly connected, and it can also be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. Terms such as "installed", "set", and "fixed" can be understood in a broad sense as connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific situations.

[0053] As used in the present disclosure, the terms "layer" and "region" refer to a portion of a material including a region having a certain thickness. The layer can extend horizontally, vertically, and / or along a conical surface. The layer can be a region of a uniform or non-uniform continuous structure, and its thickness perpendicular to the extension direction may not be greater than the thickness of the continuous structure. The layer can include multiple layers, which can be multiple stacked layers or multiple discretely extending layers. The shapes of various regions and layers in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may actually deviate due to manufacturing tolerances or technical limitations, and the design can be adjusted according to actual needs.

[0054] Reference Figure 1 , Figure 1 shows the top cover assembly of the embodiments of the present disclosure. In an exemplary embodiment, the top cover assembly 100 includes a cover plate 1 and an insulating cover 2, which are used to install the terminal post element 6.

[0055] Combined Figures 2 to 9 As shown, the top cover assembly 100 can be installed on the battery cell 300 to form the battery 200. When the battery 200 is in use, the top cover assembly 100 can face upward, or it can be in other postures.

[0056] Exemplarily, the cover plate 1 is provided with a liquid injection hole 101. The liquid injection hole 101 is communicatively connected to the battery cell 300 in an openable and closable manner, and electrolyte can be injected into the battery cell 300 through the liquid injection hole 101. The electrolyte can also be ensured to be inside the battery cell 300 at the liquid injection hole 101. However, affected by the liquid injection process, the electrolyte will still flow along the cover plate 1 at the liquid injection hole 101. The axial direction of the liquid injection hole 101 can be generally along the Z-axis direction, and the cover plate 1 can be generally parallel to the XY plane.

[0057] The insulating cover 2 protrudes from the cover plate 1 in a first direction, and the first direction can be generally parallel to the Z-axis direction. The insulating cover 2 can be laminated on the cover plate 1. Compared with the battery cell 300, it can be considered that the insulating cover 2 is on the outside or the upper side of the cover plate 1. In some embodiments, the insulating cover 2 is spaced apart from the liquid injection hole 101. Reference Figures 1 to 3, the insulating cover 2 and the liquid injection hole 101 can be arranged at intervals in the second direction, and the second direction can be parallel to the X-axis direction.

[0058] The top cover assembly 100 can include a pole column element 6, a panel 3, a cover plate 1, an insulating cover 2, and a fixing member 4 stacked in sequence along the Z-axis direction. Exemplarily, the pole column element 6 includes a pole column 61, and the pole column 61 penetrates through the panel 3, the cover plate 1, the insulating cover 2, and the fixing member 4, and the pole column 61 is fixed to the fixing member 4. The pole column 61 is arranged at intervals from the liquid injection hole 101.

[0059] The insulating cover 2 includes a corrugated structure 20, and the corrugated structure 20 surrounds the outside of the pole column 61. At least part of the corrugated structure 20 is located between the pole column 61 and the liquid injection hole 101. Exemplarily, the corrugated structure 20 also surrounds the outside of the fixing member 4, the fixing member 4 can be electrically connected to the pole column 61, and the material of the corrugated structure 20 is an insulating material.

[0060] Currently, most enterprises' approach to the problem of liquid leakage is to use dry ice cleaning or manual wiping to remove the residual electrolyte around the top cover. However, the difficulty of cleaning increases greatly after the electrolyte crystallizes, so the cleaning and wiping effects are very small.

[0061] The surface area of the corrugated structure 20 is larger. When the electrolyte leaks out from the liquid injection hole 101, the electrolyte is subject to certain resistance during the process of flowing towards the pole column 61, and the required ion conduction distance between the pole column 61 and the housing of the battery 200 is extended, making it more difficult for the electrolyte to spread and achieve conduction. Exemplarily, the pole column 61 is a negative pole column. The housing of the battery 200 can avoid conduction with the pole column 61 and can avoid the voltage being pulled down.

[0062] The top cover assembly 100 of the present disclosure embodiment is used to form the battery 200, which is beneficial to avoiding conduction between the pole column 61 of the pole column element 6 and the housing of the battery 200. The top cover assembly 100 is easy to assemble, which is beneficial to improving the manufacturing efficiency and yield of the battery 200.

[0063] The corrugated structure 20 includes a first corrugated edge 23, and the first corrugated edge 23 is located between the pole column 61 and the liquid injection hole 101. The first corrugated edge 23 can extend in the Y-axis direction, and the first corrugated edge 23 can be substantially linear. The corrugated structure 20 as a whole can be rectangular, or rounded rectangular, or oval.

[0064] Exemplarily, the insulating cover 2 includes a perforated plate 21 and a flange 22. The perforated plate 21 may be provided with two pole post through holes 211 for sleeving the pole posts 61 of the pole post elements 6. The flange 22 surrounds the perforated plate 21 and may completely surround the perforated plate 21 along the XY plane. Exemplarily, the flange 22 is a continuous structure that continuously encloses the perforated plate 21. Along the Z-axis direction, the flange 22 is higher than the perforated plate 21, and a groove may be formed between the two. The presence of the flange 22 also increases the required ion conduction distance between the pole post 61 and the housing of the battery 200.

[0065] Exemplarily, the first corrugated edge 23 is located outside the flange 22 relative to the perforated plate 21. As shown in combination Figures 2 to 4 The first corrugated edge 23 is located between the flange 22 and the liquid injection hole 101. The flange 22 protrudes from the first corrugated edge 23. Specifically, the flange 22 is higher than the first corrugated edge 23 along the Z-axis direction relative to the cover plate 1. As shown in combination Figure 6 The first corrugated edge 23 is provided with at least one receiving cavity 201 facing the liquid injection hole 101. By cooperatively arranging the flange 22 and the first corrugated edge 23, it is beneficial to effectively retain the electrolyte leaked at the liquid injection hole 101 and prevent the electrolyte from flowing to the perforated plate 21.

[0066] Exemplarily, the material of the cover plate 1 includes aluminum; the material of the insulating cover 2 includes plastic. Exemplarily, both the cover plate 1 and the insulating cover 2 are insulating materials.

[0067] Exemplarily, the receiving cavity 201 penetrates the first corrugated edge 23 along the Z-axis direction. The receiving cavity 201 communicates with the external space, making it easier to fully accommodate the electrolyte and reducing the bubble occupancy.

[0068] Referring to Figures 1 to 6 , in some embodiments, the flange 22 includes a frame body 221 and a flanging 222. The frame body 221 surrounds the perforated plate 21 and axially protrudes from the first corrugated edge 23. The frame body 221 may be a rectangular frame body, or may be a rounded rectangular, elliptical, polygonal, etc. The flanging 222 surrounds the frame body 221. The flanging 222 may be located between the surrounding frame body 221 and the liquid injection hole 101, or may completely continuously surround the frame body 221.

[0069] As Figure 5 shown, in the cross-section along the extending direction of the flanging 222, it may be rectangular or arc-shaped. The flanging 222 extends outside the frame body 221 along the XY plane. Exemplarily, the extending distance L of the flanging 222 1 satisfies: 0 mm < L 1 ≤ 20 mm, for example, 15 mm, 10 mm or 5 mm. The flanging 222 may be of equal width or unequal width and may be within any range between any two values within 20 mm. The flanging 222 is spaced apart from the first corrugated edge 23 along the axial direction of the liquid injection hole 101 or along the Z-axis direction.

[0070] When there is more electrolyte, which overflows from the first corrugated edge 23 along the Z-axis direction and flows to the frame body 221 along the X-axis direction, the electrolyte will still flow along the frame body 221 along the Z-axis direction. The flanging 222 can play a certain blocking role in the electrolyte flowing along the frame body 221, and the flange 22 can better prevent the electrolyte from flowing to the orifice plate 21, avoiding the ion conduction between the pole column 61 and the housing due to the electrolyte contacting the pole column component 6.

[0071] Exemplarily, a flanging 222 is formed on one side of the frame body 221 facing the liquid injection hole 101. A continuous flanging 222 can be formed on the entire circumference of the frame body 221. Exemplarily, the frame body 221 surrounds two pole column through holes 211, and there is an interval between the pole column through holes 211 and the frame body 221.

[0072] In some embodiments, there is a receiving groove 202 between the flange 22 and the first corrugated edge 23, which is beneficial for the flange 22 to block the electrolyte and can use the receiving groove 202 to retain the electrolyte. The flange 22 and the first corrugated edge 23 are separated and designed, which extends the ion conduction distance, thereby greatly reducing the influence of the overflowing liquid during the manufacturing process on the edge voltage, and is beneficial for controlling the edge voltage defect within an acceptable range of production. Exemplarily, the flange 22 and the first corrugated edge 23 can be connected by a thinner connecting bridge at the bottom; they can also be fixed on both sides in the Y-axis direction.

[0073] Reference Figure 5 In some embodiments, the dimension H of the flange 22 along the Z-axis direction 1 and the dimension H of the first corrugated edge 23 along the Z-axis direction 2 satisfy: H 1 / 2 < H 2 < 2H 1 / 3. The flange 22 and the first corrugated edge 23 achieve a good fit; the structure of the top cover assembly 100 is balanced and compact, ensuring the ability of the first corrugated edge 23 to block, retain, and accommodate the electrolyte, and also ensuring the effective functioning of the flange 22.

[0074] In some embodiments, the dimension H of the flange 22 along the Z-axis direction 1 satisfies H 1 ≤ 20 mm, and the structure of the top cover assembly 100 is compact. The dimension of the flange 22 along the Z-axis direction can be 17 mm, 14 mm, or 9 mm. Exemplarily, the dimension of the first corrugated edge 23 along the Z-axis direction is, for example, 14 mm, 12 mm, 10 mm, or 6 mm.

[0075] Exemplarily, along the third direction, the dimension W of the flange 22 1 satisfies W 1≤50 mm, such as 45 mm, 40 mm, 20 mm. The third direction may be substantially parallel to the Y-axis direction. In some embodiments, the size of the flange 22 is smaller than the size of the first corrugated edge 23 in the Y-axis direction. When the shape of the insulating cover 2 is pointed at both ends in the X-axis direction, the size W of the flange 22 1 can be considered to be close to zero.

[0076] In some other embodiments, the size of the flange 22 is larger than the size of the first corrugated edge 23 in the Y-axis direction. The corrugated structure 20 and the flange 22 do not have to be similar. As Figure 3 shown, the first corrugated edge 23 is substantially a straight-line structure in the Y-axis direction and is substantially parallel to the straight edge of the flange 22. In some other embodiments, the first corrugated edge 23 is substantially straight while the flange 22 has an arc edge, or the first corrugated edge 23 is arc-shaped while the flange 22 has a straight edge. When both the flange 22 and the first corrugated edge 23 are arc-shaped, the radian and the convex direction can also be different. There is a receiving groove 202 between the flange 22 and the first corrugated edge 23. The receiving groove 202 can be continuous or discontinuous; the receiving groove 202 can be of uneven and unequal thickness. The corrugated structure 20 and the flange 22 are similar rectangles, the receiving groove 202 is uniform, and the insulating cover 2 is easy to manufacture.

[0077] The size W of the first corrugated edge 23 in the Y-axis direction 2 can be the outer margin of the two outermost receiving cavities 201; or the width of one receiving cavity 201. It can be configured that W 2 ≤50 mm. Exemplarily, the width W of the receiving groove 202 3 satisfies: W 3 = W 2 ; or W 3 = W 1 . The width of the receiving groove 202 can be less than or equal to 50 mm.

[0078] The number of receiving cavities 201 provided on the first corrugated edge 23 is 1 to 50, and the number of receiving cavities 201 can be greater than or equal to 2. The corrugated structure 20 has at least one receiving cavity 201. The receiving cavity 201 faces away from the pole column 61, and at least one receiving cavity 201 is located between the pole column 61 and the liquid injection hole 101. Exemplarily, as Figure 6 shown, the first corrugated edge 23 is provided with 8 receiving cavities 201. The multiple receiving cavities 201 can hold the electrolyte and can also hold the laterally diffused electrolyte. The receiving cavities 201 included in the corrugated structure 20 can be multiple, and the multiple receiving cavities 201 are arranged at intervals along the circumferential direction of the insulating cover 2.

[0079] Combined with Figure 3 、 Figures 6 to 9As shown, in some embodiments, the profile of the accommodation cavity 201 in the cross-section in the Z-axis direction is a polygon or an arc. In other words, the accommodation cavity 201 can be generally Figure 9 the hollow triangular prism, the hollow cube shown, Figure 8 the hollow cuboid shown or other prisms; the accommodation cavity 201 can be generally a hollow cylinder or a hollow bow-shaped cylinder; the accommodation cavity 201 can be a straight column or an inclined column. The actual profile of the accommodation cavity 201 except at the opening can be a broken line or an arc. Exemplarily, the accommodation cavity 201 is Figure 6 the major arc bow-shaped cylinder shown. By designing the accommodation cavity 201, the contact area between the electrolyte and the first folded edge 23 can be increased. The solution is simple and easy to implement, does not require excessive cost increase, and has an obvious improvement effect on the edge voltage defect caused by electrolyte pollution, and can be directly promoted rapidly on the production line.

[0080] Optionally, when the profile of the accommodation cavity 201 in the cross-section in the first direction is an arc, the diameter R of the accommodation cavity 201 satisfies: R < W 1 , the top cover assembly 100 has a compact structure; it can effectively block and retain the electrolyte flowing to the orifice plate 21. Exemplarily, R < W 2 .

[0081] Exemplarily, the distance between two adjacent accommodation cavities 201 can be greater than the width of the accommodation cavity 201. The width of the accommodation cavity 201 can refer to the dimension of the accommodation cavity 201 in the Y-axis direction. Exemplarily, the distance between two adjacent accommodation cavities 201 can be less than or equal to the width of the accommodation cavity 201. The first folded edge 23 can utilize the accommodation cavity 201 to accommodate the electrolyte. Exemplarily, the first folded edge 23 includes a plurality of spacer blocks 231, and an accommodation cavity 201 is formed between two adjacent spacer blocks 231. Through the spacer blocks 231 and the accommodation cavity 201, the first folded edge 23 realizes the characteristic of a large surface area, which is beneficial to attaching the electrolyte and is beneficial to reducing the influence of overflowing liquid on the edge voltage during the manufacturing process. The first folded edge 23 cooperates with the accommodation groove 202 to further increase the surface area.

[0082] The plurality of spacer blocks 231 can be flush in height in the Z-axis direction, and the spacer blocks 231 have the same height as the accommodation cavity 201.

[0083] Referring to Figure 6 , exemplarily, in the top cover assembly 100, the insulating cover 2 further includes a second folded edge 25 and a corner portion 24. Along the vertical direction opposite to the injection hole 101 of the insulating cover 2, specifically along the Y-axis direction, the second folded edge 25 is located on one side of the flange 22, and the second folded edge 25 is connected to the first folded edge 23 through the corner portion 24, and can block more electrolyte by using the second folded edge 25, and more reliably avoid the electrolyte flowing to the orifice plate 21 and contacting the pole column 61.

[0084] In some embodiments, the corner portion 24 can be a cuboid, a cube, or a cylinder. Exemplarily, the outer side of the corner portion 24 relative to the flange 22 on the XY plane is an arc surface.

[0085] The insulating cover 2 can include a plurality of corrugated edges that completely surround the flange 22. Each corrugated edge can have a receiving cavity 201, and the receiving cavity 201 is formed by being restricted by the spacer block 231 and / or the corner portion 24.

[0086] Reference Figure 10 And in combination with Figures 1 to 5 , the embodiments of the present disclosure also provide a battery 200, which includes a battery cell 300 and a top cover assembly 100.

[0087] Exemplarily, the top cover assembly 100 includes a cover plate 1, an insulating cover 2, an inlay plate 3, a fixing member 4, a sealing ring 5, and a pole element 6. The insulating cover 2, the cover plate 1, and the inlay plate 3 are stacked in sequence along the Z-axis direction. The side where the inlay plate 3 is located can be regarded as the inner side of the cover plate 1 along the Z-axis direction. The inlay plate 3 is used to be embedded into the battery cell 300 to realize the installation of the top cover assembly 100 on the battery cell 300. The liquid injection hole 101 of the cover plate 1 communicates with the battery cell 300 through the inlay plate 3, and liquid can be injected into the battery cell 300 through the liquid injection cavity 31 of the inlay plate 3. The side where the insulating cover 2 is located is regarded as the outer side of the cover plate 1.

[0088] The cover plate 1 is provided with a pole assembly hole 102, and the pole through hole 211 provided in the insulating cover 2 corresponds to the pole assembly hole 102. The inlay plate 3 can also be provided with a through hole. The pole element 6 can be installed on the inlay plate 3. The electrode plate 62 of the pole element 6 is installed on the inlay plate 3. The pole 61 of the pole element 6 is sleeved with a sealing ring 5. The pole 61 passes through the through hole, the pole assembly hole 102, and the pole through hole 211, and protrudes from the hole plate 21 of the insulating cover 2. The fixing member 4 is stacked on the hole plate 21 and can be riveted to the pole 61.

[0089] Reference Figure 5 , the sealing ring 5 can ensure the sealing between the pole element 6 and the cover plate 1. Exemplarily, the sealing ring 5 can also be hermetically attached to the insulating cover 2, which helps to prevent the communication between the gap between the insulating cover 2 and the cover plate 1 and the pole element 6.

[0090] After the top cover assembly 100 is installed on the battery cell 300, liquid can be injected through the liquid injection hole 101 communicating with the battery cell 300. By providing the foregoing top cover assembly 100, the production yield of the battery 200 is high. The battery 200 is reliable in use.

[0091] In some embodiments, the cover plate 1 is regarded as a part of the housing of the battery 200. The battery cell 300 can have a metal jacket, and both the metal jacket and the cover plate 1 can be used as parts of the housing of the battery 200. In other embodiments, the material of the cover plate 1 is different from the material of the outer shell of the battery cell 300.

[0092] Reference Figure 11

[0093] Embodiments of the present disclosure also provide an electrical device 1000, which includes an electrical appliance 500 and a battery 200. In some embodiments, the electrical device 1000 includes an electrical appliance 500 and a battery pack 400.

[0094] The battery 200 or the battery pack 400 is electrically connected to the electrical appliance 500 to supply power to the electrical appliance 500. The electrical appliance 500 can consume power to work. The electrical device 1000 is reliable in use.

[0095] Exemplarily, the electrical device 1000 can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool, etc.

[0096] Optionally, the vehicle can be a new energy vehicle. The electrical device 1000 can be a pure electric vehicle, a hybrid electric vehicle, a range-extended electric vehicle, etc.

[0097] Optionally, the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.

[0098] Optionally, the electric toy includes a stationary or mobile electric toy. The electrical device 1000 is, for example, a game console, an electric vehicle toy, an electric ship toy, or an electric airplane toy, etc.

[0099] Optionally, the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool. The electrical device 1000 is, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, or a planer, etc.

[0100] The technical features of the above disclosed embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0101] In the above disclosed embodiments, unless otherwise clearly specified and limited, the execution order of each step is not limited. For example, they can be executed in parallel or in different orders successively. The sub-steps of each step can also be executed alternately. Various forms of the process can be used, and steps can also be reordered, added, or deleted, as long as the desired results of the technical solutions provided by the embodiments of the present disclosure can be achieved. This is not limited herein.

[0102] The embodiments disclosed above merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent protection scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all fall within the patent protection scope required by the present application. Therefore, the patent protection scope of the present application shall be subject to the appended claims.

Claims

1. A top cover assembly, characterized in that: include: A pole element, a panel, a cover plate, an insulating cover and a fixing member stacked in sequence along a first direction; The pole element comprises a pole, the pole passes through the panel, the cover plate, the insulating cover and the fixing member, and the pole is fixed to the fixing member; The cover plate is provided with a liquid injection hole, and the liquid injection hole is spaced apart from the pole; The insulating cover comprises a corrugated structure, and the corrugated structure surrounds the outer side of the pole, wherein at least a part of the corrugated structure is located between the pole and the injection hole.

2. The top cover assembly according to claim 1, characterized in that: The pleated structure has at least one accommodating cavity, the accommodating cavity faces away from the pole, and the at least one accommodating cavity is located between the pole and the injection hole.

3. The top cover assembly according to claim 1, characterized in that: The pleated structure comprises a first pleated edge, a second pleated edge and a corner portion; The first corrugated edge is located between the pole and the injection hole, the second corrugated edge is connected to the first corrugated edge through the corner portion, and the outer side surface of the corner portion is a curved surface.

4. The top cover assembly according to claim 1, characterized in that: The insulating cover also includes a perforated plate and a flange, wherein the perforated plate is provided with a pole through hole, the flange surrounds the perforated plate, the pleated structure surrounds the outer side of the flange, and the flange protrudes from the pleated structure in a direction away from the cover plate.

5. The top cover assembly according to claim 4, characterized in that: The flange includes a frame and a flange, wherein the frame surrounds the orifice plate, and the flange surrounds the frame; the flange is spaced apart from the pleated structure along a direction facing away from the cover plate.

6. The top cover assembly according to claim 5, characterized in that: A receiving groove is provided between the frame and the pleated structure.

7. The top cover assembly according to claim 4, characterized in that: The dimension H1 of the flange along the first direction and the dimension H2 of the pleated structure along the first direction satisfy: H1 / 2<H2<2H1 / 3; The dimension H1 of the flange along the first direction satisfies H1≤20 mm; the injection hole and the pole are spaced apart along the second direction, and along a third direction perpendicular to the first direction and perpendicular to the second direction, the dimension W1 of the flange satisfies W1≤50 mm; The pleated structure has at least one accommodating cavity with an arc-shaped cross-sectional profile, and a diameter R of the accommodating cavity satisfies: R<W1.

8. A battery, characterized in that include: Battery cells; as well as The top cover assembly according to any one of claims 1 to 7 is mounted on the battery cell, and the injection hole is connected to the battery cell.

9. A battery pack, characterized in that: Comprising at least one battery as claimed in claim 8.

10. An electrical device, characterized in that: include: Electrical devices; and The battery according to claim 8, electrically connected to the electrical device.

Images