Cover plate assembly of battery monomer, battery monomer, battery pack and power utilization device

Abstract

The utility model discloses a cover plate assembly of battery monomer, battery monomer, battery pack and electricity utilization device wherein the cover plate assembly of battery monomer comprises a cover plate body, pole assembly and explosion-proof valve, pole assembly and explosion-proof valve are both arranged on the cover plate body, pole assembly is suitable for being electrically connected with pole core on the same projection plane, and the explosion-proof valve is suitable for being electrically connected with the pole core on the same projection plane. The orthographic projection outer contour of the pole assembly deviates from the center of the orthographic projection outer contour of the cover plate body, the side, close to the center of the orthographic projection outer contour of the cover plate body, of the orthographic projection of the pole assembly is a first side, the orthographic projection of the anti-explosion valve is arranged close to the first side, and the projection plane is perpendicular to the thickness direction of the cover plate body. According to the cover plate assembly of the battery monomer disclosed by the embodiment of the utility model, through the arrangement, an anti-explosion valve with a large size specification can be conveniently arranged on the cover plate body, and the use safety of the battery monomer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate assembly of a battery cell, a battery cell, a battery pack and an electric device. Background Art

[0002] Because there are a large number of chemical substances inside the battery cell, a large amount of mixed gas and liquid is easily produced during the charging and discharging process, accompanied by the continuous accumulation of pressure. If these pressures are not balanced or released in time, it is easy to cause the shell of the battery cell to deform and leak, and in severe cases, it may cause the battery to explode.

[0003] In the prior art, in order to solve the above problems, an explosion-proof valve is usually provided on the cover assembly of the battery cell. The explosion-proof valve can be used to achieve rapid exhaust and pressure relief of the battery cell to play an explosion-proof role and solve the technical problem of battery cell self-explosion to a certain extent.

[0004] However, the area of ​​the explosion-proof valve on the existing cover plate assembly is relatively small, which affects the pressure relief capacity of the explosion-proof valve, thereby reducing the safety of the battery cell. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to provide a cover plate assembly for a battery cell, on which a large-area explosion-proof valve can be provided to improve the safety of the battery cell, solving the technical problem in the prior art that the area of ​​the explosion-proof valve affects the pressure relief capacity of the explosion-proof valve.

[0006] The second objective of the present invention is to provide a battery cell having the above-mentioned cover plate assembly.

[0007] The third objective of the present invention is to provide a battery pack having the above-mentioned battery cell.

[0008] A fourth objective of the present invention is to provide an electrical device having the above-mentioned battery pack.

[0009] According to the embodiment of the utility model, the cover plate assembly of the battery cell includes: a cover plate body; a pole assembly and an explosion-proof valve, wherein the pole assembly and the explosion-proof valve are both arranged on the cover plate body, and the pole assembly is suitable for being electrically connected to the pole core; on the same projection plane, the orthographic outer contour of the pole assembly deviates from the center of the orthographic outer contour of the cover plate body, and the side of the orthographic projection of the pole assembly close to the center of the orthographic outer contour of the cover plate body is the first side, the orthographic projection of the explosion-proof valve is arranged close to the first side, and the projection plane is perpendicular to the thickness direction of the cover plate body.

[0010] According to the cover plate assembly of the battery cell in the embodiment of the utility model, the above-mentioned arrangement can ensure that there is enough space on the cover plate body to set the explosion-proof valve, thereby facilitating the installation of a large-sized explosion-proof valve on the cover plate body to enhance the pressure relief capacity of the explosion-proof valve, thereby enhancing the safety of the battery cell.

[0011] In some embodiments, on the projection plane, the minimum distance between the orthographic outer contour of the explosion-proof valve and the center of the orthographic outer contour of the cover body is a first spacing, and the minimum distance between the orthographic outer contour of the pole assembly and the center of the orthographic outer contour of the cover body is a second spacing, and the first spacing is smaller than the second spacing.

[0012] In some embodiments, on the projection plane, the orthographic projection of the explosion-proof valve covers the center of the orthographic projection outer contour of the cover body.

[0013] In some embodiments, on the projection plane, the center of the orthographic projection of the explosion-proof valve is spaced apart from the center of the orthographic projection outer contour of the cover body.

[0014] In some embodiments, on the projection surface, the minimum distance between the orthographic projection outer contour of the explosion-proof valve and the orthographic projection outer contour of the cover body ranges from 3 mm to 10 mm.

[0015] In some embodiments, on the projection plane, the distance between any two points on the outer contour of the orthographic projection of the explosion-proof valve is the radial distance, and the maximum radial distance of the explosion-proof valve ranges from 6 mm to 30 mm.

[0016] In some embodiments, the explosion-proof valve includes an explosion-proof valve body and a protective sheet, the cover body includes a first surface and a second surface arranged opposite to each other along its thickness direction, the cover body is provided with a through hole passing through the first surface and the second surface, the explosion-proof valve body covers the opening of the through hole toward the first surface, and the protective sheet covers the opening of the through hole toward the second surface.

[0017] In some embodiments, a thinning area is provided on the explosion-proof valve body, and the thickness of the thinning area is 0.15 mm to 0.7 mm.

[0018] In some embodiments, the protection sheet is bonded and fixed to the second surface.

[0019] In some embodiments, the thickness of the protection sheet ranges from 0.2 mm to 0.7 mm.

[0020] In some embodiments, on the projection plane, the minimum distance between the orthographic projection outer contour of the pole assembly and the orthographic projection outer contour of the explosion-proof valve is in the range of 5mm to 15mm; and / or, the minimum distance between the orthographic projection outer contour of the pole assembly and the orthographic projection outer contour of the cover body is in the range of 3mm to 10mm.

[0021] In some embodiments, the cover body includes a first surface and a second surface arranged opposite to each other along its thickness direction, a first connecting hole penetrating the first surface and the second surface is provided on the cover body, the pole assembly is provided in the first connecting hole, and the pole assembly includes: a first pole, the first pole is connected to the second surface; a second pole, the second pole includes a connecting tube and a connecting plate, the connecting plate is connected to the first surface, the connecting tube passes through the first connecting hole to connect the first pole and the connecting plate, the connecting plate is suitable for being electrically connected to the pole core, and the first pole is provided with an avoidance hole opening toward the connecting tube, and the connecting tube is connected to the first pole through the avoidance hole.

[0022] In some embodiments, the avoidance hole includes a first hole segment close to the second surface and a second hole segment away from the second surface, the first hole segment and the second hole segment are connected, the hole diameter of the first hole segment is smaller than the hole diameter of the second hole segment to define a step surface, and the connecting tube includes a tube portion and a limiting portion connected to the tube portion, the limiting portion is arranged on one side of the axial direction of the tube portion, the limiting portion is placed on the step surface and is fixedly connected to the first pole.

[0023] In some embodiments, the connecting tube and the connecting plate are an integral part or separate parts.

[0024] In some embodiments, the pole assembly further includes a pole cover plate, and the pole cover plate is connected to the first pole to cover the avoidance hole.

[0025] In some embodiments, the cover plate assembly further includes an insulating seal, which is disposed between the pole assembly and the cover plate body.

[0026] The battery cell according to the embodiment of the utility model includes: a shell, an open accommodating cavity is formed in the shell; a pole core is arranged in the accommodating cavity; a cover plate assembly, the cover plate assembly is the aforementioned cover plate assembly, and the cover plate assembly is arranged at the opening.

[0027] According to the battery cell of the embodiment of the utility model, the aforementioned cover plate assembly is adopted to improve the safety of the battery cell.

[0028] In some embodiments, the battery cell further includes a current collecting plate, which is disposed in the accommodating cavity and between the cover plate assembly and the pole core, and the pole column assembly is electrically connected to the pole core through the current collecting plate.

[0029] In some embodiments, the collecting plate is provided with a connecting protrusion protruding toward the pole assembly, and the pole assembly is cooperatively connected with the connecting protrusion.

[0030] In some embodiments, the battery cell is formed as a cylindrical battery, and the middle of the pole core has a central hole; in the thickness direction of the cover body, at least part of the explosion-proof valve is arranged opposite to the central hole.

[0031] In some embodiments, the battery cell is formed as a cylindrical battery, and the middle of the pole core has a central hole; in the thickness direction of the cover body, the explosion-proof valve is arranged opposite to a portion of the central hole.

[0032] The battery pack according to the embodiment of the present invention includes a plurality of the aforementioned battery cells.

[0033] According to the battery pack of the embodiment of the present invention, the safety of the battery pack is improved by adopting the aforementioned battery monomer.

[0034] The electric device according to the embodiment of the present invention includes the aforementioned battery cell or the aforementioned battery pack.

[0035] According to the electric device of the embodiment of the utility model, the use safety of the electric device is improved and the use cost of the electric device is reduced by adopting the above-mentioned battery cell or battery pack.

[0036] Additional aspects and advantages of the present invention will become apparent from the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 It is a top view of the cover plate assembly of some embodiments of the first aspect of the utility model.

[0039] Figure 2 It is an exploded view of the cover plate assembly and the collecting plate of some embodiments of the first aspect of the utility model when they are matched.

[0040] Figure 3 It is a cross-sectional view of the cover plate assembly and the collecting plate of some embodiments of the first aspect of the utility model when they are matched.

[0041] Figure 4for Figure 3 A partial enlarged view of area Ⅰ in the middle.

[0042] Figure 5 It is a top view of the cover assembly of some embodiments of the second aspect of the utility model.

[0043] Figure 6 It is a top view of the cover plate assembly of some embodiments of the third aspect of the utility model.

[0044] Figure 7 It is a top view of the cover plate assembly of some embodiments of the fourth aspect of the utility model.

[0045] Figure 8 It is an exploded view of the cover plate assembly and the collecting plate of some embodiments of the fifth aspect of the utility model when they are matched.

[0046] Fig. 9 It is a schematic diagram of the second pole of some embodiments of the fifth aspect of the utility model.

[0047] Fig.10 It is a cross-sectional view of the cover plate assembly and the collecting plate of some embodiments of the fifth aspect of the utility model when they are matched.

[0048] Fig.11 for Figure 2 Schematic diagram of the collecting plate in .

[0049] Fig.12 for Figure 8 Schematic diagram of the collecting plate in .

[0050] Reference numerals:

[0051] 1000, cover plate assembly;

[0052] 100, cover plate body;

[0053] 110, through hole; 120, first communicating hole;

[0054] 130, first surface; 140, second surface;

[0055] 200, pole assembly;

[0056] 210, first pole;

[0057] 211, avoidance hole; 212, step surface;

[0058] 220, second pole;

[0059] 221, connecting tube; 2211, tube portion; 2212, limiting portion;

[0060] 222, connecting plate;

[0061] 230, pole cover;

[0062] 300, explosion-proof valve;

[0063] 320, explosion-proof valve body; 310, thinning area;

[0064] 400, protective film;

[0065] 500, insulation seal;

[0066] 510, insulating member; 511, insulating portion; 512, sealing portion;

[0067] 520, seals;

[0068] 2000, collector plate;

[0069] 2010, connecting protrusion; 2020, second connecting hole. DETAILED DESCRIPTION

[0070] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0072] It should be noted that traditional batteries, because they are sodium-based batteries or large-capacity batteries, when a short circuit occurs inside the battery, the electrolyte will quickly vaporize under the high temperature of the short circuit, thereby generating a large amount of gas. In order to improve the safety of battery use, an explosion-proof valve is usually provided on the battery. When a large amount of gas is generated in the battery, the explosion-proof valve ruptures to discharge the gas, thereby improving the safety of battery use.

[0073] However, the area of ​​the existing explosion-proof valve is too small, and the too small explosion-proof valve cannot meet the timely discharge of the internal pressure of the battery, which poses a safety problem of battery explosion.

[0074] In the prior art, in order to solve the above problems, double explosion-proof valves are usually provided, but the structural cost of the double explosion-proof valves is relatively high.

[0075] To this end, the present application provides a cover plate assembly 1000 for a battery cell.

[0076] The cap plate assembly 1000 of a battery cell according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0077] Combination Figure 1 and Figure 2 As shown, a cover plate assembly 1000 of a battery cell according to an embodiment of the present invention includes: a cover plate body 100 , a pole assembly 200 and an explosion-proof valve 300 .

[0078] Among them, combined Figure 1 , Figure 2 and Figure 3 As shown, the pole assembly 200 and the explosion-proof valve 300 are both arranged on the cover body 100, and the pole assembly 200 is suitable for being electrically connected to the pole core. Here, it means that the battery cell has a pole core, and the pole assembly 200 arranged on the cover body 100 is used to be electrically connected to the pole core, so that the pole assembly 200 is convenient for drawing out the current of the pole core to ensure the working performance of the pole core.

[0079] At the same time, by arranging both the pole assembly 200 and the explosion-proof valve 300 on the cover body 100, the cover body 100 can also be used to support the pole assembly 200 and the explosion-proof valve 300, thereby improving the position stability of the pole assembly 200 and the explosion-proof valve 300, thereby ensuring the working performance of the pole assembly 200 and the explosion-proof valve 300.

[0080] Among them, the explosion-proof valve 300 is mainly used to rupture when a large amount of gas is generated in the battery cell, so that the gas in the battery cell can pass through the explosion-proof valve 300, which to a certain extent avoids the safety problem of the battery cell being unable to discharge in time due to internal pressure, thereby improving the safety of battery use.

[0081] On the same projection plane, the orthographic projection of the pole assembly 200 deviates from the center of the orthographic projection outer contour of the cover body 100, and the side of the orthographic projection of the pole assembly 200 close to the center of the orthographic projection outer contour of the cover body 100 is the first side, and the orthographic projection of the explosion-proof valve 300 is arranged close to the first side, and the projection plane is perpendicular to the thickness direction of the cover body 100. The thickness direction here can be understood as Figure 3 In the X direction shown in , the orthographic projection of the pole assembly 200, the explosion-proof valve 300 and the cover assembly 1000 in the direction perpendicular to the thickness of the cover body 100 can also be understood as the orthographic projection of the pole assembly 200, the explosion-proof valve 300 and the cover assembly 1000 on a plane parallel to the cover body 100. Figure 1The cover body 100 shown in FIG. 1 is the plane of the cover body 100 .

[0082] That is to say, the orthographic outer contour of the pole assembly 200 on a plane parallel to the cover body 100 is set away from the center of the orthographic outer contour of the cover body 100 on a plane parallel to the cover body 100, and the projection of the explosion-proof valve 300 on a plane parallel to the cover body 100 is located on the side of the orthographic projection of the pole assembly 200 close to the center of the orthographic outer contour of the cover body 100.

[0083] The above can also be understood as, in the radial direction of the cover body 100, the pole assembly 200 is set away from the radial center of the cover body 100, the explosion-proof valve 300 and the pole assembly 200 are arranged in sequence in the radial direction of the cover body 100, and the explosion-proof valve 300 is located on the side of the pole assembly 200 close to the radial center of the cover body 100.

[0084] It should be noted that the deviation of the orthographic outer contour of the pole assembly 200 from the center of the orthographic outer contour of the cover body 100 can be understood as the center of the orthographic projection of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100 are spaced apart on the projection plane; the radial direction of the cover body 100 is perpendicular to the axial direction of the cover body 100, and the axial direction of the cover body 100 can be understood as Figure 3 The X direction is shown in .

[0085] In addition, when the shape of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100 is formed into a circular shape, the center is the center of the circle of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100; when the shape of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100 is formed into a square shape, the center is the intersection of the diagonals of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100; when the shape of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100 is formed into a triangular shape, the center is the intersection of the three medians of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100.

[0086] Through the above-mentioned arrangement, the pole assembly 200 can give up the radial center area of ​​the cover body 100, so that in the radial direction of the cover body 100, there is enough space for the cover body 100 to be located on one side of the pole assembly 200. In this way, when the explosion-proof valve 300 is arranged on the side of the pole assembly 200 close to the center of the cover body 100 in the radial direction of the cover body 100, it can be ensured that there is enough space on the cover body 100 to set the explosion-proof valve 300, so as to facilitate the arrangement of a large-sized explosion-proof valve 300 on the cover body 100, so as to improve the pressure relief capacity of the explosion-proof valve 300 and ensure the smoothness of exhaust to a certain extent, thereby improving the safety of the battery cell.

[0087] That is to say, the focus of this application is on the structural design of the cover assembly 1000. While ensuring that the pole assembly 200 and the explosion-proof valve 300 can be both arranged on the cover body 100, it is preferred to design the explosion-proof valve 300 that affects the safety performance of the battery cell, and enhance the pressure relief capacity of the explosion-proof valve 300, thereby ensuring the working performance of the battery cell to a certain extent.

[0088] In summary, the present application provides a cover plate assembly 1000 that is different from the current state of the art in the industry. The main technical solution is to design the pole assembly 200 to be offset relative to the radial center of the cover plate body 100, thereby freeing up the radial center area of ​​the cover plate body 100, which is conducive to designing a large-sized explosion-proof valve 300 on the cover plate body 100, replacing the existing sodium-based material system or large-capacity battery with a bidirectional double explosion-proof valve structure, simplifying the structure of the cover plate body 100, achieving directional and effective explosion protection, and improving the safety performance of the battery cell.

[0089] It can be seen from the above structure that the cover plate assembly 1000 of the battery cell of the embodiment of the utility model creatively sets the position of the pole assembly 200 and adaptively adjusts the position of the explosion-proof valve 300 to achieve the setting of a large-sized explosion-proof valve 300. In this way, while simplifying the structure of the cover plate assembly 1000, the safety of the battery cell can also be improved.

[0090] It can be understood that compared with the prior art of designing a two-way double explosion-proof valve to improve the safety of battery use, the cover assembly 1000 of the battery cell of the present application can not only improve the safety of battery cell use, but also simplify the structure of the cover assembly 1000, reduce the manufacturing cost of the cover assembly 1000, and help improve the manufacturing efficiency of the cover assembly 1000.

[0091] It should be noted that Figure 2 The explosion-proof valve 300 is shown to be circular in shape. In other embodiments, the explosion-proof valve 300 may be designed to be any geometric shape such as a rectangle, triangle, trapezoid, ring or sector according to actual process or performance requirements, and this application does not impose any specific limitation.

[0092] In some embodiments, on the projection plane, the orthographic projection area of ​​the explosion-proof valve 300 is S1, and the orthographic projection area of ​​the cover plate assembly 1000 is S, wherein S1=0.2S~0.8S, and the units of S and S1 are the same. That is to say, the orthographic projection area S1 of the explosion-proof valve 300 on the plane parallel to the cover plate body 100 is 0.2~0.8 times the orthographic projection area S of the cover plate assembly 1000 on the plane parallel to the cover plate body 100, wherein, when S1 and S meet the above range, it can ensure that the area of ​​the explosion-proof valve 300 itself is appropriate, improve the exhaust performance of the explosion-proof valve 300, thereby increasing the safety of the battery cell to a certain extent, and at the same time, it can also make the area occupied by the explosion-proof valve 300 on the cover plate body 100 more appropriate, and there is enough space on the cover plate body 100 to arrange the pole assembly 200, which is convenient for the size and installation of the pole assembly 200.

[0093] That is to say, the present application sets the orthographic projection area S1 of the explosion-proof valve 300 in the direction perpendicular to the thickness of the cover body 100 to 0.2 to 0.8 times the orthographic projection area S of the cover assembly 1000 in the direction perpendicular to the thickness of the cover body 100. While ensuring that the gas production during instantaneous vaporization of the electrolyte can be smoothly discharged through the explosion-proof valve 300, it can also ensure that the explosion-proof valve 300 occupies a suitable space on the cover body 100, which is conducive to ensuring the size of the pole assembly 200.

[0094] It should be noted that the same units of S and S1 mean that, when the unit of the orthographic projection area S1 of the explosion-proof valve 300 in the direction perpendicular to the thickness of the cover body 100 is square centimeters, the unit of the orthographic projection area S of the cover assembly 1000 in the direction perpendicular to the thickness of the cover body 100 is also square centimeters; when the unit of the orthographic projection area S1 of the explosion-proof valve 300 in the direction perpendicular to the thickness of the cover body 100 is square meters, the unit of the orthographic projection area S of the cover assembly 1000 in the direction perpendicular to the thickness of the cover body 100 is also square meters.

[0095] That is to say, the present application preferably designs the explosion-proof valve 300 that affects the safety performance of the battery cell, ensures the area of ​​the explosion-proof valve 300, so as to improve the pressure relief capacity of the explosion-proof valve 300, thereby ensuring the working performance of the battery cell to a certain extent.

[0096] In some embodiments, S1=0.2S-0.5S. This is to further optimize the coverage area of ​​the explosion-proof valve 300 on the cover body 100, and ensure that the gas produced when the electrolyte is instantly gasified can be smoothly discharged through the explosion-proof valve 300. At the same time, it can also further ensure that the explosion-proof valve 300 occupies a suitable space on the cover body 100, which is conducive to ensuring the size of the pole assembly 200.

[0097] In a specific example, S1=0.2S, 0.3S, 0.4S, 0.5S, 0.6S, 0.7S or 0.8S, etc.

[0098] In some embodiments, on the projection plane, the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100 is a first spacing, and the minimum distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100 is a second spacing, and the first spacing is smaller than the second spacing. That is to say, on the projection plane, there are multiple distances between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100, and there are multiple distances between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100, wherein the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100 is smaller than the minimum distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100, so that relative to the pole assembly 200, in the radial direction of the cover body 100, the explosion-proof valve 300 can be arranged closer to the radial center of the cover body 100, thereby facilitating the arrangement of a large-sized explosion-proof valve 300 on the cover body 100, so as to improve the pressure relief capacity of the explosion-proof valve 300, thereby improving the safety of battery cells.

[0099] It should be noted that the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100 means that on the projection plane, there are multiple distances between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100. The shortest distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100 is defined as the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100.

[0100] Correspondingly, the minimum distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100 means that, on the projection plane, there are multiple distances between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100, and the closest distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100 is defined as the minimum distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100.

[0101] In the description of the present utility model, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe the features, without any distinction in order or importance.

[0102] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, on the projection plane, the orthographic projection of the explosion-proof valve 300 covers the center of the orthographic projection outer contour of the cover body 100. It can also be understood here that on the projection plane, the center of the orthographic projection outer contour of the cover body 100 is located within the orthographic projection of the explosion-proof valve 300, so that the explosion-proof valve 300 can be arranged closer to the center of the cover body 100 in the radial direction of the cover body 100, which is conducive to using the space on the cover body 100 to arrange a large-sized explosion-proof valve 300, thereby improving the pressure relief capacity of the explosion-proof valve 300.

[0103] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, on the projection plane, the center of the orthographic projection of the explosion-proof valve 300 is spaced from the center of the orthographic projection outer contour of the cover body 100. This can avoid that the radial center of the explosion-proof valve 300 is arranged opposite to the radial center of the cover body 100 in the axial direction of the cover body 100, so that the explosion-proof valve 300 can be offset relative to the radial center of the cover body 100, which is convenient for providing space for the arrangement of the pole assembly 200, so that the pole assembly 200 can be effectively arranged on the cover body 100, reducing the difficulty of fixing the pole assembly 200.

[0104] That is to say, in the radial direction of the cover body 100, the explosion-proof valve 300 and the pole assembly 200 on the cover assembly 1000 of the present application are both set away from the radial center of the cover body 100 to achieve rational utilization of the space on the cover body 100. While ensuring that the explosion-proof valve 300 and the pole assembly 200 can both be arranged on the cover body 100, it is also possible to set a large-sized explosion-proof valve 300 to improve the pressure relief capacity of the explosion-proof valve 300, thereby improving the safety of battery cell use.

[0105] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, in the radial direction of the cover body 100, the outer contour of the explosion-proof valve 300 is spaced from the outer edge of the cover body 100. It should be noted that, since the explosion-proof valve 300 needs to be arranged on the cover body 100 through a mounting hole (such as the through hole 110 described below), by spacing the outer contour of the explosion-proof valve 300 from the outer edge of the cover body 100, the mounting hole can be spaced from the outer edge of the cover body 100, thereby avoiding damage to the cover body 100 in the process of opening the mounting hole to a certain extent, extending the service life of the cover body 100, and at the same time improving the structural strength of the cover body 100.

[0106] In some embodiments, on the projection plane, the minimum distance between the orthographic projection outer contour of the explosion-proof valve 300 and the orthographic projection outer contour of the cover body 100 is in the range of 3mm to 10mm. It can also be understood here that on a plane parallel to the cover body 100, there are multiple distances between the orthographic projection outer contour of the explosion-proof valve 300 and the orthographic projection outer contour of the cover body 100, and the value range of the closest distance is 3mm to 10mm. It can also be understood that on a plane parallel to the cover body 100, the minimum distance between the orthographic projection outer contour of the through hole 110 and the orthographic projection outer contour of the cover body 100 is in the range of 3mm to 10mm.

[0107] Therefore, the minimum distance between the orthographic projection outer contour of the explosion-proof valve 300 and the orthographic projection outer contour of the cover body 100 on the projection surface mentioned above can be understood as Figure 1 As shown in the figure, when L1 is kept in a suitable range, the structural strength of the cover body 100 is ensured, and the explosion-proof valve 300 occupies a suitable space on the cover body 100. There is enough space on the cover body 100 to arrange the pole assembly 200, thereby ensuring the size and installation of the pole assembly 200.

[0108] That is to say, the present application sets the value range of the minimum spacing L1 between the orthographic outer contour of the explosion-proof valve 300 and the orthographic outer contour of the cover body 100 on the projection plane to 3mm to 10mm. In this way, while ensuring the structural strength of the cover body 100, it can also ensure that the explosion-proof valve 300 occupies a suitable space on the cover body 100, so that there is enough space on the cover body 100 to arrange the pole assembly 200, which is conducive to ensuring the size of the pole assembly 200, improving the working performance of the pole assembly 200, and reducing the installation difficulty of the pole assembly 200.

[0109] In a specific example, on the projection plane, the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the orthographic outer contour of the cover body 100 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc.

[0110] In some embodiments, on the projection surface, the distance between any two points on the outer contour of the orthographic projection of the explosion-proof valve 300 is the radial distance, and the maximum radial distance of the explosion-proof valve 300 has a value range of 6 mm to 30 mm. Here, it means that on the projection surface, when the orthographic projection of the explosion-proof valve 300 has multiple radial distances, the maximum radial distance has a value range of 6 mm to 30 mm, so that the outer dimensions of the explosion-proof valve 300 range from 6 mm to 30 mm.

[0111] Among them, when the maximum radial distance of the explosion-proof valve 300 is designed to be within the above range, on the one hand, the area of ​​the explosion-proof valve 300 will be appropriate, the exhaust performance of the explosion-proof valve 300 will be improved, and the safety of the battery cell will be improved; on the other hand, the occupied area of ​​the explosion-proof valve 300 will be appropriate, and there will be enough space on the cover body 100 to arrange the pole assembly 200, thereby ensuring the size and installation of the pole assembly 200.

[0112] Therefore, the present application sets the maximum radial distance range of the explosion-proof valve 300 to 6 mm to 30 mm. In this way, while ensuring that the gas production during instantaneous vaporization of the electrolyte can be smoothly discharged through the explosion-proof valve 300, it can also ensure that the explosion-proof valve 300 occupies a suitable space on the cover body 100, which is conducive to ensuring the size of the pole assembly 200, improving the working performance of the pole assembly 200, and reducing the difficulty of installing the pole assembly 200.

[0113] In a specific example, the maximum radial distance of the explosion-proof valve 300 is 6 mm, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm.

[0114] It should be noted that the maximum radial distance of the explosion-proof valve 300 can be understood as Figure 1 L2 shown in .

[0115] When the explosion-proof valve 300 is formed in a circular shape, the maximum radial distance of the explosion-proof valve 300 can also be understood as the diameter of the explosion-proof valve 300 .

[0116] Of course, in some other embodiments, the maximum radial distance of the explosion-proof valve 300 can also be adjusted according to the material system of the battery cell, the diameter of the pole core, the capacity of the battery cell or the electrolyte weight of the battery cell, and is not limited to being set to the above-mentioned 6mm to 30mm.

[0117] In some embodiments, in combination Figure 2 and Figure 3 As shown, the explosion-proof valve 300 includes an explosion-proof valve body 320 and a protective sheet 400, and the cover body 100 includes a first surface 130 and a second surface 140, the first surface 130 and the second surface 140 are arranged opposite to each other along the thickness direction of the cover body 100, and the cover body 100 is provided with a through hole 110 penetrating the first surface 130 and the second surface 140, the explosion-proof valve body 320 covers the opening of the through hole 110 toward the first surface 130, and the protective sheet 400 covers the opening of the through hole 110 toward the second surface 140. The thickness direction of the cover body 100 mentioned here can be understood as Figure 3 The X direction shown in FIG. 1 is the axial direction of the cover plate body 100 .

[0118] That is to say, the cover body 100 includes a first surface 130 and a second surface 140 which are arranged opposite to each other in the axial direction of the cover body 100. The cover body 100 is also provided with a through hole 110 which penetrates the first surface 130 and the second surface 140, so that the through hole 110 penetrates the cover body 100 in the axial direction of the cover body 100. After the through hole 110 is formed, the through hole 110 has an opening facing the first surface 130 and an opening facing the second surface 140. By covering the opening of the through hole 110 facing the first surface 130 with the explosion-proof valve body 320 and covering the opening of the through hole 110 facing the second surface 140 with the protective sheet 400, it is possible to cover the through hole 110 with the explosion-proof valve 300. Not only can the explosion-proof valve 300 be used to improve the safety of the battery cell, but also external foreign matter can be prevented from entering the battery cell through the through hole 110, thereby ensuring the working performance of the battery cell to a certain extent.

[0119] In some embodiments, in combination Figure 2 and Figure 3 As shown, the explosion-proof valve body 320 is arranged at the opening of the through hole 110 toward the first surface 130, so that the explosion-proof valve body 320 can be arranged on the cover body 100, thereby facilitating the use of the cover body 100 to support the explosion-proof valve body 320, improving the position stability of the explosion-proof valve body 320, and reducing the difficulty of matching the explosion-proof valve body 320 with the cover body 100.

[0120] Optionally, the explosion-proof valve body 320 is connected to the opening of the through hole 110 toward the first surface 130 by laser welding and fusion. This can reduce the difficulty of matching the explosion-proof valve body 320 with the cover body 100 while ensuring the connection strength between the explosion-proof valve body 320 and the cover body 100, improve the position stability of the explosion-proof valve body 320, and thus ensure the working performance of the explosion-proof valve body 320.

[0121] It should be noted that after the explosion-proof valve body 320 is laser welded, it is necessary to ensure that there are no cold welds or weld holes and that it has the airtightness required by the design.

[0122] In some embodiments, in combination Figure 2 and Figure 3 As shown, the protection sheet 400 is arranged at the opening of the through hole 110 toward the second surface 140, so that the protection sheet 400 is arranged on the cover body 100, and the explosion-proof valve body 320 and the protection sheet 400 are arranged at opposite ends of the through hole 110, so that the protection sheet 400 is used to protect the explosion-proof valve body 320, and external foreign matter is prevented from falling into the explosion-proof valve body 320 and causing damage to the explosion-proof valve body 320, thereby ensuring the working performance of the explosion-proof valve body 320, ensuring that the explosion-proof valve body 320 can effectively realize the rapid exhaust and pressure relief of the battery monomer, so as to play an explosion-proof role, and to a certain extent solve the technical problem of battery monomer self-explosion.

[0123] Optionally, the protective sheet 400 is made of rubber to ensure that the protective sheet 400 can be dissolved when heated, so as to ensure that when the explosion-proof valve body 320 is exhausted due to thermal runaway, the protective sheet 400 can be dissolved to facilitate the discharge of gas through the through hole 110, thereby ensuring the safety of the battery cell.

[0124] In some embodiments, in combination Figure 1 and Figure 2 As shown, the explosion-proof valve body 320 is provided with a thinning area 310, and the thickness of the thinning area 310 is 0.15mm to 0.7mm. This ensures that when the internal pressure of the battery cell is high, the explosion-proof valve body 320 can be effectively ruptured, so that the gas in the battery cell can be discharged through the explosion-proof valve 300 to achieve the effect of pressure relief and explosion prevention, and ensure the working performance of the explosion-proof valve 300.

[0125] In some embodiments, a thinning notch structure may be provided on the explosion-proof valve body 320 to form a thinning area 310 on the explosion-proof valve body 320 , thereby ensuring the working performance of the explosion-proof valve 300 .

[0126] The shape of the thinned area 310 may be any geometric shape such as a circle, annular or geometric cross.

[0127] It should be noted that the thickness of the thinned area 310 mentioned above can be understood as the thickness of part of the structure on the explosion-proof valve body 320 after being compressed and thinned. When the thickness of the thinned area 310 is thin, the structural strength of the explosion-proof valve body 320 will be reduced, shortening the service life of the explosion-proof valve body 320; when the thickness of the thinned area 310 is thick, when the internal pressure of the battery cell is high, it cannot be guaranteed that the explosion-proof valve body 320 can be effectively ruptured, reducing the safety of the battery cell.

[0128] Therefore, the present application sets the thickness of the thinned area 310 to 0.15mm~0.7mm. In this way, while the structural strength of the explosion-proof valve body 320 is maintained, it can also ensure that when the internal pressure of the battery cell is high, the explosion-proof valve body 320 can be effectively ruptured, thereby facilitating the discharge of gas in the battery cell through the explosion-proof valve 300, so as to achieve the effect of pressure relief and explosion prevention, thereby improving the safety of the battery cell.

[0129] In a specific example, the thickness of the thinned area 310 is 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0130] Of course, in some other embodiments, the thickness of the thinned area 310 may also be determined according to the explosion-proof pressure designed for each type of battery cell.

[0131] In some embodiments, the protective sheet 400 is bonded and fixed to the second surface 140. In this way, the protective sheet 400 is fixedly connected to the cover body 100, and when the thermal runaway exhaust is generated, the connection between the protective sheet 400 and the cover body 100 can be dissolved by heat, which facilitates the exhaust of gas and further ensures the safety of the battery cell.

[0132] In some embodiments, the thickness of the protective sheet 400 ranges from 0.2 mm to 0.7 mm. Figure 3 As shown in T, when the thickness of the protective sheet 400 is designed to be within the above range, the working performance of the protective sheet 400 will be further improved, so that the protective sheet 400 can effectively protect the explosion-proof valve body 320, which is conducive to the dissolution of the protective sheet 400 when heated, thereby improving the exhaust effect.

[0133] Therefore, the present application sets the thickness range of the protection sheet 400 to 0.2 mm to 0.7 mm, so that while ensuring the working performance of the protection sheet 400 and ensuring that the protection sheet 400 can effectively protect the explosion-proof valve body 320, the protection sheet 400 can also be dissolved when heated to facilitate gas discharge.

[0134] In a specific example, the thickness of the protection sheet 400 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0135] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, in the radial direction of the cover body 100, the pole assembly 200 is spaced from the outer edge of the explosion-proof valve 300 and the cover body 100. Since the pole assembly 200 is arranged on the cover body 100 through the mounting hole (such as the first connecting hole 120 described below), by spacing the pole assembly 200 from the outer edge of the explosion-proof valve 300 and the cover body 100 in the radial direction of the cover body 100, the first connecting hole 120 can be spaced from the outer edge of the cover body 100, thereby avoiding damage to the cover body 100 in the process of opening the first connecting hole 120 to a certain extent, extending the service life of the cover body 100, and improving the structural strength of the cover body 100. It can also avoid damage to the explosion-proof valve 300 caused by the pole assembly 200 during the assembly process to ensure the working performance of the explosion-proof valve 300.

[0136] That is to say, by spacing the pole assembly 200 from the explosion-proof valve 300 and the outer edge of the cover body 100 in the radial direction of the cover body 100, the structural strength of the cover body 100 and the working performance of the explosion-proof valve 300 can be ensured.

[0137] In some embodiments, on the projection plane, the minimum spacing between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300 is in the range of 5mm to 15mm. Here, it means that on a plane parallel to the cover body 100, there are multiple distances between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300, and the value range of the closest distance is 5mm to 15mm. It can also be understood that on a plane parallel to the cover body 100, the minimum spacing between the orthographic projection outer contour of the first connecting hole 120 and the orthographic projection outer contour of the through hole 110 is in the range of 5mm to 15mm.

[0138] Therefore, the minimum distance between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300 on the projection plane mentioned above can be understood as Figure 1 As shown in the figure, when L3 is designed to be of appropriate size, it is convenient to assemble the pole assembly 200 and the explosion-proof valve 300, further improve the working performance of the pole assembly 200 and the explosion-proof valve 300, and is conducive to setting a large-sized explosion-proof valve 300. On the other hand, it is also convenient to set a suitable distance between the pole assembly 200 and the outer edge of the cover body 100 to ensure the structural strength of the cover body 100.

[0139] That is to say, the present application sets the value range of the minimum spacing L3 between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the explosion-proof valve 300 on the projection plane to 5mm to 15mm. In this way, while ensuring the structural strength of the cover body 100, it can also prevent the pole assembly 200 from causing damage to the explosion-proof valve 300 during the assembly process, thereby ensuring the working performance of the explosion-proof valve 300. At the same time, it is also convenient to set a large-sized explosion-proof valve 300, thereby improving the safety of the battery cell.

[0140] In a specific example, on the projection plane, the minimum distance between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300 is 5 mm, 8 mm, 10 mm, 12 mm or 15 mm, etc.

[0141] Optionally, on the projection plane, the minimum spacing between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100 is in the range of 3mm to 10mm. This means that on a plane parallel to the cover body 100, there are multiple distances between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100, and the value range of the closest distance is 3mm to 10mm. It can also be understood that on a plane parallel to the cover body 100, the minimum spacing between the orthographic outer contour of the first connecting hole 120 and the orthographic outer contour of the cover body 100 is in the range of 3mm to 10mm.

[0142] Therefore, the minimum distance between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the cover body 100 on the projection plane mentioned above can be understood as Figure 1 As shown in the figure, when L4 is designed to be of appropriate size, the distance between the first connecting hole 120 and the outer edge of the cover body 100 will be appropriate, thereby improving the structural strength of the cover body 100; at the same time, the pole assembly 200 will occupy an appropriate space on the cover body 100, thereby allowing sufficient space on the cover body 100 to arrange the explosion-proof valve 300 and other structural parts, which is conducive to setting a large-sized explosion-proof valve 300 and improving the safety of the battery cell.

[0143] That is to say, the present application sets the value range of the minimum distance L4 between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100 on the projection plane to 3mm to 10mm. In this way, while ensuring the structural strength of the cover body 100, it can also ensure that the pole assembly 200 occupies a suitable space on the cover body 100, so that there is enough space on the cover body 100 to arrange the explosion-proof valve 300, which is conducive to ensuring the size of the explosion-proof valve 300, improving the working performance of the explosion-proof valve 300, and thus improving the safety of the battery cell.

[0144] In a specific example, on the projection plane, the minimum distance between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc.

[0145] In some embodiments, in combination Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, the outer shape of the pole assembly 200 can be any closed geometric shape such as annular, rectangular, sector-shaped, arc-shaped or circular, and the present application does not impose any specific limitation.

[0146] In some embodiments, in combination Figure 2 and Figure 3As shown, the cover body 100 includes a first surface 130 and a second surface 140, and the first surface 130 and the second surface 140 are relatively arranged along the thickness direction of the cover body 100. A first connecting hole 120 penetrating the first surface 130 and the second surface 140 is provided on the cover body 100, and the pole assembly 200 is arranged in the first connecting hole 120. What is meant here is that the cover body 100 includes a first surface 130 and a second surface 140 which are arranged opposite to each other in the axial direction of the cover body 100, and a first connecting hole 120 is also provided on the cover body 100 which passes through the first surface 130 and the second surface 140, so that the first connecting hole 120 passes through the cover body 100 in the axial direction of the cover body 100. By arranging the pole assembly 200 in the first connecting hole 120, the pole assembly 200 can be arranged on the cover body 100, so that it is convenient to use the cover body 100 to support the pole assembly 200, improve the position stability of the pole assembly 200, and reduce the difficulty of matching the pole assembly 200 with the cover body 100.

[0147] In some embodiments, in combination Figure 3 and Figure 4 As shown, the pole assembly 200 includes a first pole 210 and a second pole 220, the first pole 210 is connected to the second surface 140, the second pole 220 includes a connecting tube 221 and a connecting plate 222, the connecting plate 222 is connected to the first surface 130, the connecting tube 221 passes through the first connecting hole 120 to connect the first pole 210 and the connecting plate 222, the connecting plate 222 is suitable for being electrically connected to the pole core, and the first pole 210 is provided with an avoidance hole 211 opening toward the connecting tube 221, and the connecting tube 221 is connected to the first pole 210 through the avoidance hole 211. Here, it means that the connecting plates 222 of the first pole 210 and the second pole 220 are respectively arranged on opposite sides of the cover body 100. Since the first pole 210 is provided with an avoidance hole 211 opening toward the connecting tube 221, the connecting tube 221 of the second pole 220 can effectively pass through the first connecting hole 120 of the cover body 100 and the avoidance hole 211 of the first pole 210 to connect the first pole 210 and the connecting plate 222, thereby realizing the electrical connection between the first pole 210 and the connecting plate 222. In this way, when the connecting plate 222 is electrically connected to the pole core, the first pole 210 can be used to lead the current of the pole core to ensure the working performance of the pole core and reduce the difficulty of electrical connection between the pole core and the external structural parts.

[0148] The above can also be understood as setting the second pole 220 to a connecting tube 221 and a connecting plate 222, wherein the connecting plate 222 is mainly used for electrical connection with the pole core, and the connecting tube 221 is used to realize a fixed connection between the second pole 220 and the first pole 210, thereby realizing a fixed connection between the pole core and the first pole 210, making it easy to use the first pole 210 to lead out the current of the pole core to ensure the working performance of the pole core.

[0149] In some embodiments, the connecting tube 221 is formed as a hollow part to facilitate the electrical connection between the connecting plate 222 and the pole core, thereby reducing the difficulty of connecting the connecting plate 222 and the pole core, and further reducing the difficulty of connecting the pole assembly 200 and the pole core.

[0150] In a specific example, since the connecting tube 221 is formed as a hollow part, during the process of connecting the pole assembly 200 with the pole core, a connecting tool can pass through the connecting tube 221 and act on the connecting plate 222, thereby facilitating the electrical connection between the connecting plate 222 and the pole core.

[0151] In addition, an avoidance hole 211 communicating with the connecting tube 221 is provided on the first pole 210 so that the connecting tube 221 can pass through the first pole 210 and thus be connected to the first pole 210 , thereby reducing the difficulty of connecting the connecting tube 221 to the first pole 210 .

[0152] It is also worth noting that, compared with the prior art, the present application configures the pole assembly 200 to consist of a first pole 210 and a second pole 220, which can reduce the difficulty of assembling the pole assembly 200 and the cover body 100, making the pole assembly 200 easy to assemble, so that the pole assembly 200 can be effectively arranged on the opposite sides of the cover body 100, and it is also convenient to process the first pole 210 separately, so as to ensure that the first pole 210 has a sufficiently large welding surface and ensure the flatness of the first pole 210, and in the process of assembling the first pole 210 and the second pole 220, it is convenient to use the first pole 210 and the second pole 220 to cooperate and squeeze the insulating seal 500 arranged between the pole assembly 200 and the cover body 100 at the same time (the specific structure of the insulating seal 500 can be seen in Figure 4 ) to ensure the sealing effect of the insulating seal 500.

[0153] In some embodiments, Figure 4 As shown, the avoidance hole 211 includes a first hole section close to the second surface 140 and a second hole section away from the second surface 140, the first hole section and the second hole section are connected, the aperture of the first hole section is smaller than the aperture of the second hole section to define the step surface 212, the connecting tube 221 includes a barrel portion 2211 and a limiting portion 2212, the limiting portion 2212 is connected to the barrel portion 2211, the limiting portion 2212 is arranged on one side of the axial direction of the barrel portion 2211, the limiting portion 2212 is placed on the step surface 212 and is fixedly connected to the first pole 210. In this way, while achieving the fixed connection between the connecting tube 221 and the first pole 210, the connection difficulty between the connecting tube 221 and the first pole 210 can be reduced, and the connection strength between the connecting tube 221 and the first pole 210 is ensured, so that the first pole 210 and the second pole 220 are fixedly connected.

[0154] It should be noted that by setting the aperture of the first hole segment to be smaller than the aperture of the second hole segment, mainly by providing an inwardly concave groove on the inner circumferential wall of the first pole 210 to form a step surface 212, it is convenient to achieve fixed connection between the first pole 210 and the second pole 220.

[0155] In some embodiments, the limiting portion 2212 of the connecting tube 221 is riveted and fixed to the first pole 210 to ensure the connection strength between the connecting tube 221 and the first pole 210 . At the same time, it is also convenient to use the connecting tube 221 and the first pole 210 to cooperate to compress the insulating seal 500, further ensuring the sealing effect of the insulating seal 500 .

[0156] In some embodiments, in combination Figure 2 and Figure 8 As shown, the connecting tube 221 and the connecting plate 222 are an integral part or a separate part. That is, the connecting tube 221 and the connecting plate 222 can be formed by an integral molding process, or the connecting tube 221 and the connecting plate 222 can be processed separately. After the connecting tube 221 and the connecting plate 222 are processed, the connecting tube 221 and the connecting plate 222 are assembled and connected to form the second pole 220.

[0157] In some embodiments, Figure 2 As shown, the second pole 220 can be processed by cold heading process so that the connecting tube 221 and the connecting plate 222 are formed into an integral part, thereby eliminating the connection between the connecting tube 221 and the connecting plate 222, reducing the processing difficulty of the second pole 220, and improving the forming efficiency of the second pole 220.

[0158] In some other embodiments, combined with Figure 8 , Fig. 9 and Fig.10 As shown, the connecting tube 221 and the connecting plate 222 are separate parts, and both the connecting tube 221 and the connecting plate 222 can be processed and formed by a stamping process. After the stamping is completed, the connecting tube 221 and the connecting plate 222 are welded to form the second pole 220. Since the stamping production process has a low manufacturing cost, the above-mentioned setting can effectively reduce the manufacturing cost of the second pole 220.

[0159] Optionally, the connecting tube 221 and the connecting plate 222 are assembled into the second pole 220 by continuous laser penetration welding to ensure the connection strength between the connecting tube 221 and the connecting plate 222 .

[0160] In some embodiments, in combination Figure 2 , Figure 3 and Figure 4As shown, the pole assembly 200 further includes a pole cover 230, which is connected to the first pole 210 to cover the avoidance hole 211. In this way, while preventing foreign objects from falling into the avoidance hole 211, the pole cover 230 can be used to facilitate the electrical connection between the pole assembly 200 and external structural parts (such as busbars), thereby facilitating the electrical connection between multiple battery cells.

[0161] In a specific example, during the assembly of the battery cell, the connecting plate 222 is first connected to the pole core through the connecting tube 221. After the connection is completed, the pole cover 230 is connected to the first pole 210 to cover the avoidance hole 211 and increase the connection area between the pole assembly 200 and the external structural parts to ensure the stability of the connection.

[0162] Optionally, the pole cover plate 230 is welded to the first pole 210 to increase the connection strength between the pole cover plate 230 and the first pole 210 , so that the relative positions of the pole cover plate 230 and the first pole 210 are stable.

[0163] Of course, in some other embodiments, if the size of the first pole 210 meets the welding surface requirements when assembling multiple battery cells, the pole cover 230 may not be provided to simplify the structure of the pole assembly 200 and reduce the manufacturing difficulty and manufacturing cost of the pole assembly 200.

[0164] In some embodiments, in combination Figure 4 and Fig.10 As shown, the cap plate assembly 1000 further includes an insulating seal 500, which is disposed between the pole assembly 200 and the cap plate body 100. The pole assembly 200 and the cap plate body 100 form an insulating seal fit, thereby preventing the pole assembly 200 and the cap plate body 100 from forming an electrical connection, so as to ensure the working performance of the battery cell.

[0165] In some embodiments, when the first pole 210 and the second pole 220 are connected, the insulating seal 500 can be compressed to form insulation and sealing between the pole assembly 200 and the cover body 100 and ensure the sealing effect of the insulating seal 500 .

[0166] Optionally, combined Figure 2 , Figure 3 and Figure 4 As shown, the insulating seal 500 includes an insulating member 510 and a sealing member 520, and the insulating member 510 and the sealing member 520 are arranged on opposite sides of the cover body 100, so as to arrange the insulating seal 500 between the pole assembly 200 and the cover body 100, thereby achieving insulating and sealing cooperation between the cover body 100 and the pole assembly 200, and reducing the difficulty of installing the insulating seal 500 and the cover body 100.

[0167] In some embodiments, in combination Figure 2 , Figure 3 and Figure 4 As shown, the insulating member 510 is arranged on the outer side of the cover body 100, and the sealing member 520 is arranged on the inner side of the cover body 100. The insulating member 510 is injection-molded by a high-performance thermoplastic resin, such as polyphenylene sulfide, to ensure the insulating performance of the insulating member 510, so that the cover body 100 and the pole assembly 200 can effectively form an insulating interval; the sealing member 520 is made of fluororubber, EPDM rubber or fusible polytetrafluoroethylene, so that while ensuring the insulating performance of the sealing member 520, the sealing member 520 can also have a certain sealing performance, provide a sealing function for the pole assembly 200, and avoid the electrolyte in the battery cell from overflowing, so as to ensure the working performance of the battery cell.

[0168] In some embodiments, in combination Figure 8 and Fig.10 As shown, the insulating member 510 includes an insulating portion 511 and a sealing portion 512. The sealing portion 512 is arranged opposite to the sealing member 520. The insulating portion 511 is arranged on the outer periphery of the sealing portion 512, so that the insulating member 510 has an insulating sealing effect. In this way, while ensuring the insulation coordination between the cover body 100 and the pole assembly 200, it can also further avoid the overflow of the electrolyte in the battery cell to ensure the working performance of the battery cell.

[0169] In some embodiments, Figure 4 and Fig.10 As shown, the insulating seal 500 is clamped between the first pole 210 and the connecting plate 222. In this way, while achieving the insulating and sealing cooperation between the pole assembly 200 and the cover body 100, the difficulty of assembling the insulating seal 500 can be reduced, and it is convenient to use the first pole 210 and the second pole 220 to cooperate and squeeze the insulating seal 500, so as to improve the sealing effect of the insulating seal 500.

[0170] The battery cell of the embodiment of the present utility model is described below.

[0171] Combination Figure 2 and Figure 8 As shown, a battery cell according to an embodiment of the present invention includes: a shell, a pole core and a cover plate assembly 1000.

[0172] An open accommodation cavity is formed in the shell, and the pole core is arranged in the accommodation cavity, so that the pole core is arranged in the shell, and the shell is used to protect the pole core, prolong the service life of the pole core, and improve the safety of the pole core.

[0173] Combination Figure 2 , Figure 3 and Figure 4As shown, the cover plate assembly 1000 is the aforementioned cover plate assembly 1000, and the specific structure of the cover plate assembly 1000 is not described here, and the cover plate assembly 1000 is arranged at the opening. In this way, while the cover plate assembly 1000 is used to block the opening of the shell, the cover plate assembly 1000 can also be arranged directly opposite the pole core, so as to realize the electrical connection between the pole column assembly 200 of the cover plate assembly 1000 and the pole core, and ensure the working performance of the pole core.

[0174] At the same time, since the aforementioned cover plate assembly 1000 can be provided with a large-sized explosion-proof valve 300, the battery cell of the embodiment of the utility model can effectively improve the safety of the battery cell by adopting the aforementioned cover plate assembly 1000.

[0175] In some embodiments, the shell is formed by stamping or welding, and the shell is made of aluminum or steel.

[0176] In some embodiments, the current collecting plate 2000 is disposed in the accommodating cavity and between the cover plate assembly 1000 and the pole core, and the pole assembly 200 is electrically connected to the pole core through the current collecting plate 2000. Thus, the pole core and the pole assembly 200 are electrically connected, reducing the difficulty of connecting the pole core and the pole assembly 200.

[0177] In some embodiments, the collecting plate 2000 is welded to the pole core and pole column assembly 200 respectively. This allows the pole core and pole column assembly 200 to form an electrical connection while ensuring the connection strength of the pole core and pole column assembly 200, reducing the connection difficulty of the pole core and pole column assembly 200, and improving the assembly efficiency and structural stability of the battery cell.

[0178] In some embodiments, in combination Figure 2 , Figure 3 and Figure 4 As shown, the current collecting plate 2000 is provided with a connecting protrusion 2010 protruding toward the pole assembly 200, and the pole assembly 200 is matched and connected with the connecting protrusion 2010. This realizes the matched connection between the pole assembly 200 and the current collecting plate 2000, and reduces the difficulty of connecting the pole assembly 200 and the current collecting plate 2000, thereby reducing the difficulty of electrical connection between the pole assembly 200 and the pole core, so as to ensure the working performance of the pole core.

[0179] At the same time, by providing a connecting protrusion 2010 protruding toward the pole assembly 200 on the current collecting disk 2000, on the one hand, a buffer can be formed during the connection process between the current collecting disk 2000 and the pole assembly 200, thereby ensuring the contact area between the current collecting disk 2000 and the pole assembly 200 and improving the connection strength. On the other hand, the process of forming the lead-out sheet can be omitted. In this way, while simplifying the manufacturing process of the current collecting disk 2000, the manufacturing cost of the current collecting disk 2000 can also be reduced, thereby reducing the manufacturing cost of the battery cell. At the same time, it can also avoid damage to the pole core during the connection process of the pole assembly 2000 and the current collecting disk 2000 to ensure the performance of the pole core.

[0180] In some embodiments, the connecting plate 222 of the pole assembly 200 and the connecting protrusion 2010 of the current collecting plate 2000 are welded by penetration welding. In this way, while achieving the matching connection between the pole assembly 200 and the current collecting plate 2000, the connection strength between the pole assembly 200 and the current collecting plate 2000 can be ensured, and the connection difficulty between the pole assembly 200 and the current collecting plate 2000 can be reduced.

[0181] In a specific example, when the pole assembly 200 and the current collecting plate 2000 need to be connected, the position of the connecting protrusion 2010 of the current collecting plate 2000 can be first identified by a CCD (Charge Coupled Device) camera, and then the connecting plate 222 of the pole assembly 200 can be aligned and assembled and compacted with the connecting protrusion 2010 of the current collecting plate 2000 by correcting the angle of the cover assembly 1000 to ensure that the connecting plate 222 and the connecting protrusion 2010 are tightly fitted, and finally the welding tool is passed through the connecting tube 221 to act on the connecting plate 222, thereby facilitating the penetration welding of the connecting plate 222 and the connecting protrusion 2010 and ensuring the connection quality.

[0182] In addition, since the welding surface of the current collecting disk 2000 of the present application is directly formed on the connecting protrusion 2010 on the current collecting disk 2000, the current flow capacity of the current collecting disk 2000 can be guaranteed, thereby achieving the performance requirements of high-rate charge and discharge.

[0183] In some embodiments, in combination Figure 2 and Fig.11 As shown, the connecting protrusion 2010 is a bridge-shaped member formed on the collecting plate 2000, so that the connecting protrusion 2010 can be protruded toward the pole assembly 200 and can also play a buffering role to ensure the contact area between the collecting plate 2000 and the pole assembly 200 and improve the connection strength.

[0184] Of course, in other embodiments, combined with Figure 8 and Fig.12As shown, a local structure of the collecting plate 2000 may also be punched to form the connecting protrusion 2010 .

[0185] In some embodiments, the battery cell is formed as a cylindrical battery, and the middle of the pole core has a central hole; in the thickness direction of the cover body 100, at least part of the explosion-proof valve 300 is arranged opposite to the central hole. Since the central hole of the pole core has a certain size, after the battery cell is filled with liquid, part of the electrolyte will remain in the central hole of the pole core. When the battery cell has thermal runaway, the electrolyte in the central hole will release a large amount of gas by heat decomposition. By arranging at least part of the explosion-proof valve 300 opposite to the central hole, it can be ensured that a large amount of gas in the central hole can be quickly discharged, so that the gas in the battery cell can be quickly discharged, thereby improving the safety of the battery cell.

[0186] In some embodiments, the battery cell is formed as a cylindrical battery, and the middle of the pole core has a central hole; in the thickness direction of the cover body 100, the explosion-proof valve 300 is arranged opposite to part of the central hole. Here, it means that in the thickness direction of the cover body 100, not the entire structure of the central hole is opposite to the explosion-proof valve 300, but part of the structure of the central hole is opposite to the explosion-proof valve 300, so that the explosion-proof valve 300 can be offset relative to the center of the cover body 100, while avoiding the explosion-proof valve 300 from occupying too much space on the cover body 100, and it can also make a certain distance between the pole assembly 200 and the explosion-proof valve 300, and ensure that a large amount of gas in the central hole can be quickly discharged.

[0187] Optionally, combined Figure 2 , Figure 3 and Fig.10 As shown, the collecting plate 2000 is provided with a second connecting hole 2020 facing the center hole to achieve the connection between the center hole and the explosion-proof valve 300, which to a certain extent avoids the collecting plate 2000 from hindering the discharge of the gas in the center hole, thereby ensuring that a large amount of gas in the center hole can be effectively and quickly discharged through the explosion-proof valve 300, thereby improving the safety of the battery cell.

[0188] The battery pack according to an embodiment of the present invention is described below.

[0189] A battery pack according to an embodiment of the present invention includes: a plurality of battery cells.

[0190] The battery cell is the aforementioned battery cell, and the specific structure of the battery cell is not described in detail here.

[0191] It should be noted that, since the aforementioned battery cell is provided with the cover plate assembly 1000 , the battery pack of the embodiment of the utility model can effectively improve the safety of the battery pack by adopting the aforementioned battery cell.

[0192] In the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0193] The following describes an electric device according to an embodiment of the present utility model.

[0194] An electrical device according to an embodiment of the utility model includes: a battery cell or a battery pack.

[0195] The battery cell is the aforementioned battery cell, and the specific structure of the battery cell is not described in detail here. The battery pack is also the aforementioned battery pack, and the specific structure of the battery pack is not described in detail here.

[0196] It should be noted that, since the aforementioned battery cell or battery pack is provided with the cover plate assembly 1000 , the electrical device of the embodiment of the utility model can effectively improve the safety of the electrical device by adopting the aforementioned battery cell or battery pack.

[0197] It should also be noted that the electrical devices mentioned here may be but are not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery vehicles, electric vehicles, ships, spacecraft, etc.

[0198] Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys; spacecraft may include airplanes, rockets, space shuttles and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0199] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0200] The cover plate assembly 1000 of the battery cell, the battery cell, the battery pack and other components of the electrical device according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0201] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0202] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly for a battery cell, characterized in that: include: Cover plate body; A pole assembly and an explosion-proof valve, both of which are arranged on the cover plate body, and the pole assembly is suitable for being electrically connected to the pole core; On the same projection plane, the orthographic outer contour of the pole assembly deviates from the center of the orthographic outer contour of the cover body, the side of the orthographic projection of the pole assembly close to the center of the orthographic outer contour of the cover body is the first side, the orthographic projection of the explosion-proof valve is arranged close to the first side, and the projection plane is perpendicular to the thickness direction of the cover body.

2. The cover plate assembly of the battery cell according to claim 1, characterized in that: On the projection surface, the minimum distance between the orthographic outer contour of the explosion-proof valve and the center of the orthographic outer contour of the cover body is a first spacing, and the minimum distance between the orthographic outer contour of the pole assembly and the center of the orthographic outer contour of the cover body is a second spacing, and the first spacing is smaller than the second spacing.

3. The cover plate assembly of the battery cell according to claim 1, characterized in that: On the projection surface, the orthographic projection of the explosion-proof valve covers the center of the orthographic projection outer contour of the cover body.

4. The cover plate assembly of the battery cell according to claim 1, characterized in that: On the projection surface, the center of the orthographic projection of the explosion-proof valve is spaced from the center of the orthographic projection outer contour of the cover body.

5. The cover plate assembly of the battery cell according to claim 1, characterized in that: On the projection surface, the minimum distance between the orthographic projection outer contour of the explosion-proof valve and the orthographic projection outer contour of the cover body is in the range of 3 mm to 10 mm.

6. The cover plate assembly of the battery cell according to claim 1, characterized in that: On the projection surface, the distance between any two points on the outer contour of the orthographic projection of the explosion-proof valve is the radial distance, and the maximum radial distance of the explosion-proof valve ranges from 6 mm to 30 mm.

7. The cover plate assembly of a battery cell according to any one of claims 1 to 6, characterized in that: The explosion-proof valve includes an explosion-proof valve body and a protective sheet. The cover body includes a first surface and a second surface arranged opposite to each other along its thickness direction. The cover body is provided with a through hole passing through the first surface and the second surface. The explosion-proof valve body covers the opening of the through hole toward the first surface, and the protective sheet covers the opening of the through hole toward the second surface.

8. The cover plate assembly of the battery cell according to claim 7, characterized in that: A thinning area is provided on the explosion-proof valve body, and the thickness of the thinning area is 0.15mm to 0.7mm.

9. The cover plate assembly of the battery cell according to claim 7, characterized in that: The protection sheet is bonded and fixed to the second surface.

10. The cover plate assembly of the battery cell according to claim 7, characterized in that: The thickness of the protection sheet ranges from 0.2 mm to 0.7 mm.

11. The cover plate assembly of the battery cell according to claim 1, characterized in that: On the projection plane, the minimum distance between the orthographic projection outer contour of the pole assembly and the orthographic projection outer contour of the explosion-proof valve is in the range of 5 mm to 15 mm; and / or, On the projection surface, the minimum distance between the orthographic projection outer contour of the pole assembly and the orthographic projection outer contour of the cover body is in the range of 3 mm to 10 mm.

12. The cover plate assembly of a battery cell according to any one of claims 1 to 6, characterized in that: The cover body comprises a first surface and a second surface which are arranged opposite to each other along the thickness direction thereof, a first connecting hole which passes through the first surface and the second surface is provided on the cover body, the pole assembly is arranged in the first connecting hole, and the pole assembly comprises: a first pole connected to the second surface; The second pole comprises a connecting tube and a connecting plate, the connecting plate is connected to the first surface, the connecting tube passes through the first connecting hole to connect the first pole and the connecting plate, the connecting plate is suitable for being electrically connected to the pole core, the first pole is provided with an avoidance hole opening toward the connecting tube, and the connecting tube is connected to the first pole through the avoidance hole.

13. The cover plate assembly of the battery cell according to claim 12, characterized in that: The avoidance hole includes a first hole segment close to the second surface and a second hole segment away from the second surface, the first hole segment and the second hole segment are connected, the hole diameter of the first hole segment is smaller than the hole diameter of the second hole segment to define a step surface, and the connecting cylinder includes a cylinder portion and a limiting portion connected to the cylinder portion, the limiting portion is arranged on one side of the axial direction of the cylinder portion, the limiting portion is placed on the step surface and is fixedly connected to the first pole.

14. The cover plate assembly of the battery cell according to claim 12, characterized in that: The connecting tube and the connecting plate are an integral part or separate parts.

15. The cover plate assembly of the battery cell according to claim 12, characterized in that: The pole assembly further includes a pole cover plate, which is connected to the first pole to cover the avoidance hole.

16. The cover plate assembly of the battery cell according to claim 12, characterized in that: An insulating seal is also included, and the insulating seal is arranged between the pole assembly and the cover plate body.

17. A battery cell, characterized in that: include: A housing, wherein an open accommodating cavity is formed in the housing; A pole core, the pole core being arranged in the accommodating cavity; A cover plate assembly, wherein the cover plate assembly is the cover plate assembly according to any one of claims 1-16, and the cover plate assembly is arranged at the opening.

18. The battery cell according to claim 17, characterized in that: It also includes a current collecting plate, which is arranged in the accommodating cavity and located between the cover plate assembly and the pole core, and the pole assembly is electrically connected to the pole core through the current collecting plate.

19. The battery cell according to claim 18, characterized in that: The current collecting plate is provided with a connecting protrusion protruding toward the pole assembly, and the pole assembly is cooperatively connected with the connecting protrusion.

20. The battery cell according to claim 17, characterized in that: The battery cell is formed as a cylindrical battery, and the middle of the pole core has a central hole; In the thickness direction of the cover plate body, at least a portion of the explosion-proof valve is arranged opposite to the central hole.

21. The battery cell according to claim 17, characterized in that: The battery cell is formed as a cylindrical battery, the middle of the pole core has a central hole, and in the thickness direction of the cover plate body, the explosion-proof valve is arranged opposite to a part of the central hole.

22. A battery pack, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 17 to 21.

23. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 17 to 21 or the battery pack according to claim 22.

Images