Cover plate assembly of battery cell, battery cell, battery pack, and electric device

Abstract

A cover plate assembly (1000) of a battery cell (3000), a battery cell (3000), a battery pack (4000), and an electric device (5000). The cover plate assembly (1000) comprises a cover plate body (100), and a terminal assembly (200) and an explosion-proof valve (300) that are arranged on the cover plate body (100). The terminal assembly (200) is electrically connected to an electrode core. On the projection plane perpendicular to the direction of thickness of the cover plate body (100), the orthographic projection outer contour of the terminal assembly (200) deviates from the center of the orthographic projection outer contour of the cover plate body (100), the side of the orthographic projection of the terminal assembly (200) that is close to the center of the orthographic projection outer contour of the cover plate body (100) is a first side, and the orthographic projection of the explosion-proof valve (300) is arranged close to the first side.

Description

Cover plate assembly of battery monomer, battery monomer, battery pack and electric device

[0001] Cross-reference to related applications

[0002] The present application is based on the Chinese patent application No. 2024208157236, filed on April 18, 2024, and claims priority to the above-mentioned Chinese patent application, the entire contents of which are hereby incorporated by reference into the present application. TECHNICAL FIELD

[0003] The present application belongs to the technical field of batteries, and specifically relates to a cover plate assembly of a battery monomer, a battery monomer, a battery pack and an electric device. BACKGROUND

[0004] The inside of a battery monomer has a large amount of chemical substances, and a large amount of mixed gas and liquid is easily generated in the charging and discharging process. There is also continuously accumulated pressure, and if the pressure is not balanced or released in time, the shell of the battery monomer is easily deformed and leaks liquid, and in severe cases, the battery is even exploded.

[0005] In the prior art, in order to solve the above problems, an explosion-proof valve is usually arranged on the cover plate assembly of the battery monomer, and the explosion-proof valve can be used to realize rapid exhaust and pressure relief of the battery monomer, so as to play a role in explosion prevention, and to a certain extent, solve the technical problem of self-explosion of the battery monomer.

[0006] However, the area of the explosion-proof valve on the existing cover plate assembly is small, which affects the pressure relief capacity of the explosion-proof valve, thereby reducing the use safety of the battery monomer. SUMMARY

[0007] Therefore, the present application provides a cover plate assembly of a battery monomer, which can be provided with a large-area explosion-proof valve to improve the use safety of the battery monomer, and solve the technical problem that the area of the explosion-proof valve in the prior art affects the pressure relief capacity of the explosion-proof valve.

[0008] The cover plate assembly of the battery monomer according to the embodiments of the present application comprises: a cover plate body; a pole assembly arranged on the cover plate body, the pole assembly being adapted to be electrically connected with a pole core; and an explosion-proof valve arranged on the cover plate body; on the same projection plane, the orthographic projection contour of the pole assembly deviates from the center of the orthographic projection contour of the cover plate body, the side of the orthographic projection of the pole assembly close to the center of the orthographic projection contour of the cover plate body is a first side, and 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.

[0009] According to the cover plate assembly of the battery cell provided in the embodiments of the present application, the sufficient space for arranging the explosion-proof valve on the cover plate body is ensured, so that the explosion-proof valve with large size can be arranged on the cover plate body, the pressure relief capacity of the explosion-proof valve is improved, and the use safety of the battery cell is improved.

[0010] Optionally, on the projection plane, the minimum distance between the outer contour of the explosion-proof valve in the orthographic projection and the center of the cover plate body in the orthographic projection is a first distance, and the minimum distance between the outer contour of the pole assembly in the orthographic projection and the center of the cover plate body in the orthographic projection is a second distance, and the first distance is smaller than the second distance.

[0011] Optionally, on the projection plane, the explosion-proof valve in the orthographic projection covers the center of the cover plate body in the orthographic projection.

[0012] Optionally, on the projection plane, the center of the explosion-proof valve in the orthographic projection is spaced apart from the center of the cover plate body in the orthographic projection.

[0013] Optionally, on the projection plane, the minimum distance between the outer contour of the explosion-proof valve in the orthographic projection and the outer contour of the cover plate body in the orthographic projection is in the range of 3 mm to 10 mm.

[0014] Optionally, on the projection plane, the distance between any two points on the outer contour of the explosion-proof valve in the orthographic projection is a radial distance, and the maximum radial distance of the explosion-proof valve is in the range of 6 mm to 30 mm.

[0015] Optionally, the explosion-proof valve comprises an explosion-proof valve body and a protective sheet, the cover plate body comprises a first surface and a second surface oppositely arranged along the thickness direction of the cover plate body, the cover plate body is provided with a through hole penetrating through the first surface and the second surface, the explosion-proof valve body covers the opening of the through hole facing the first surface, and the protective sheet covers the opening of the through hole facing the second surface.

[0016] Optionally, the explosion-proof valve body is provided with a thinned region, and the thickness of the thinned region is in the range of 0.15 mm to 0.7 mm.

[0017] Optionally, the protective sheet is fixedly bonded to the second surface.

[0018] Optionally, the thickness of the protective sheet is in the range of 0.2 mm to 0.7 mm.

[0019] Optionally, on the projection plane, the minimum distance between the outer contour of the pole assembly in the orthographic projection and the outer contour of the explosion-proof valve in the orthographic projection is in the range of 5 mm to 15 mm, and / or the minimum distance between the outer contour of the pole assembly in the orthographic projection and the outer contour of the cover plate body in the orthographic projection is in the range of 3 mm to 10 mm.

[0020] Optionally, the cover plate body comprises a first surface and a second surface oppositely arranged along the thickness direction thereof, the cover plate body is provided with a first communication hole penetrating through the first surface and the second surface, and the pole post assembly is arranged in the first communication hole.

[0021] Optionally, the avoiding hole comprises a first hole section close to the second surface and a second hole section away from the second surface, the first hole section and the second hole section are in communication, the aperture of the first hole section is smaller than the aperture of the second hole section to define a step surface, the connecting cylinder comprises a cylinder portion and a limiting portion connected with the cylinder portion, the limiting portion is arranged on one side of the cylinder portion in the axial direction, the limiting portion is arranged on the step surface and fixedly connected with the first pole post.

[0022] Optionally, the connecting cylinder and the connecting plate are an integral piece or separate pieces.

[0023] Optionally, the pole post assembly further comprises a pole post cover plate, the pole post cover plate is connected with the first pole post to cover the avoiding hole.

[0024] Optionally, the cover plate assembly further comprises an insulation sealing piece, the insulation sealing piece is arranged between the pole post assembly and the cover plate body.

[0025] The battery cell according to the embodiment of the present application comprises: a shell, an accommodating cavity with an opening formed in the shell; a pole core, the 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.

[0026] The battery cell according to the embodiment of the present application adopts the aforementioned cover plate assembly to improve the use safety of the battery cell.

[0027] Optionally, the battery cell further comprises a current collecting disc, the current collecting disc is arranged in the accommodating cavity and located between the cover plate assembly and the pole core, and the pole post assembly is electrically connected with the pole core through the current collecting disc.

[0028] Optionally, the current collecting disc is provided with a connecting protrusion protruding towards the pole post assembly, and the pole post assembly is connected with the connecting protrusion in a matching mode.

[0029] Optionally, the battery cell is formed as a cylindrical battery, the middle part of the pole core has a center hole; in the thickness direction of the cover plate body, at least part of the explosion-proof valve is arranged opposite to the center hole.

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

[0031] The battery pack according to the embodiments of the present application comprises a plurality of the aforementioned battery cells.

[0032] The battery pack according to the embodiments of the present application adopts the aforementioned battery cell, so as to improve the use safety of the battery pack.

[0033] The electric device according to the embodiments of the present application comprises the aforementioned battery cell or the aforementioned battery pack.

[0034] The electric device according to the embodiments of the present application adopts the aforementioned battery cell or the battery pack, so as to improve the use safety of the electric device and reduce the use cost of the electric device.

[0035] Additional aspects and advantages of the present application will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, including the accompanying drawings, in which:

[0037] Fig. 1 is a top view of a cover plate assembly according to some embodiments of the first aspect of the present application.

[0038] Fig. 2 is an exploded view of the cover plate assembly and the current collecting disc when they are matched according to some embodiments of the first aspect of the present application.

[0039] Fig. 3 is a sectional view of the cover plate assembly and the current collecting disc when they are matched according to some embodiments of the first aspect of the present application.

[0040] Fig. 4 is a partial enlarged view of region I in Fig. 3.

[0041] Fig. 5 is a top view of a cover plate assembly according to some embodiments of the second aspect of the present application.

[0042] Fig. 6 is a top view of a cover plate assembly according to some embodiments of the third aspect of the present application.

[0043] Fig. 7 is a top view of a cover plate assembly according to some embodiments of the fourth aspect of the present application.

[0044] Fig. 8 is an exploded view of the cover plate assembly and the current collecting disc when they are matched according to some embodiments of the fifth aspect of the present application.

[0045] FIG. 9 is a schematic view of a second pole post according to some embodiments of the fifth aspect of the application.

[0046] FIG. 10 is a sectional view of a cover plate assembly cooperating with a current collector plate according to some embodiments of the fifth aspect of the application.

[0047] FIG. 11 is a schematic view of the current collector plate in FIG. 2.

[0048] FIG. 12 is a schematic view of the current collector plate in FIG. 8.

[0049] FIG. 13 is a schematic view of an electric device according to some embodiments of the application.

[0050] Reference signs: 1000, cover plate assembly; 100, cover plate body; 110, through hole; 120, first communication hole; 130, first surface; 140, second surface; 200, pole post assembly; 210, first pole post; 211, avoiding hole; 212, step surface; 220, second pole post; 221, connecting cylinder; 2211, cylinder portion; 2212, limiting portion; 222, connecting plate; 230, pole post cover plate; 300, explosion-proof valve; 320, explosion-proof valve body; 310, thinning region; 400, protective sheet; 500, insulating sealing member; 510, insulating member; 511, insulating portion; 512, sealing portion; 520, sealing member; 2000, current collector plate; 2010, connecting protrusion; 2020, second communication hole; 3000, battery monomer; 4000, battery pack; 5000, electric device. DETAILED DESCRIPTION

[0051] Embodiments of the application are described in detail below with reference to the accompanying drawings, in which examples of the embodiments are shown, wherein the same or similar notations are used to denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the application, and cannot be understood as a limitation on the application.

[0052] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0053] It should be noted that the conventional battery is a sodium battery or a large-capacity battery. When a short circuit occurs inside the battery, the electrolyte will quickly vaporize under the action of high temperature of the short circuit, and a large amount of gas will be generated. In order to improve the safety of the battery in 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 breaks to discharge the gas and improve the safety of the battery in use.

[0054] However, the area of the existing explosion-proof valve is too small, and the small explosion-proof valve cannot meet the timely discharge of the internal pressure of the battery, and there is a safety problem of battery explosion.

[0055] In the prior art, in order to solve the above problems, a double explosion-proof valve is usually provided, but the structure of the double explosion-proof valve has a high cost.

[0056] Therefore, the application provides a cover plate assembly 1000 of a battery monomer 3000.

[0057] The cover plate assembly 1000 of the battery monomer 3000 of the embodiment of the application will be described below with reference to the accompanying drawings of the specification.

[0058] As shown in FIGS. 1 and 2, the cover plate assembly 1000 of the battery monomer 3000 according to the embodiment of the application comprises a cover plate body 100, a pole assembly 200 and an explosion-proof valve 300.

[0059] As shown in FIGS. 1, 2 and 3, the pole assembly 200 is arranged on the cover plate body 100, and the pole assembly 200 is adapted to be electrically connected with a pole core. Here, the battery monomer 3000 has a pole core, and the pole assembly 200 arranged on the cover plate body 100 is used to be electrically connected with the pole core, so as to facilitate the use of the pole assembly 200 to lead out the current of the pole core, thereby ensuring the working performance of the pole core.

[0060] As shown in FIGS. 1, 2 and 3, the explosion-proof valve 300 is arranged on the cover plate body 100. Here, it can be understood that the pole assembly 200 and the explosion-proof valve 300 are both arranged on the cover plate body 100, and the cover plate body 100 can be used to support the pole assembly 200 and the explosion-proof valve 300, thereby improving the positional stability of the pole assembly 200 and the explosion-proof valve 300, and ensuring the working performance of the pole assembly 200 and the explosion-proof valve 300.

[0061] The explosion-proof valve 300 is mainly used to break when a large amount of gas is generated in the battery monomer 3000, so that the gas in the battery monomer 3000 can pass through the explosion-proof valve 300, to a certain extent, to avoid the safety problem that the battery monomer 3000 cannot be discharged in time due to internal pressure, thereby improving the safety of the battery in use.

[0062] In the same projection plane, the orthographic projection of the pole column assembly 200 deviates from the center of the orthographic projection outer contour of the cover plate body 100, the side of the orthographic projection of the pole column assembly 200 close to the center of the orthographic projection outer contour of the cover plate body 100 is a first side, and the orthographic projection of the explosion-proof valve 300 is arranged close to the first side. The projection plane is perpendicular to the thickness direction of the cover plate body 100. Wherein, the thickness direction herein can be understood as the X direction shown in FIG. 3, and the orthographic projection of the pole column assembly 200, the explosion-proof valve 300 and the cover plate assembly 1000 in the thickness direction perpendicular to the cover plate body 100 can also be understood as the orthographic projection of the pole column assembly 200, the explosion-proof valve 300 and the cover plate assembly 1000 in the plane parallel to the cover plate body 100. The cover plate body 100 shown in FIG. 1 is the plane of the cover plate body 100.

[0063] That is, the orthographic projection outer contour of the pole column assembly 200 in the plane parallel to the cover plate body 100 is arranged to deviate from the center of the orthographic projection outer contour of the cover plate body 100 in the plane parallel to the cover plate body 100, and the projection of the explosion-proof valve 300 in the plane parallel to the cover plate body 100 is located on the side of the orthographic projection of the pole column assembly 200 close to the center of the orthographic projection outer contour of the cover plate body 100.

[0064] The above can also be understood as follows: in the radial direction of the cover plate body 100, the pole column assembly 200 is arranged to deviate from the radial center of the cover plate body 100, the explosion-proof valve 300 and the pole column assembly 200 are arranged in sequence in the radial direction of the cover plate body 100, and the explosion-proof valve 300 is located on the side of the pole column assembly 200 close to the radial center of the cover plate body 100.

[0065] It should be noted that the orthographic projection outer contour of the pole column assembly 200 deviating from the center of the orthographic projection outer contour of the cover plate body 100 can be understood as that the center of the orthographic projection of the pole column assembly 200 and the center of the orthographic projection outer contour of the cover plate body 100 are arranged to be spaced apart in the projection plane; the radial direction of the cover plate body 100 is perpendicular to the axial direction of the cover plate body 100, and the axial direction of the cover plate body 100 can be understood as the X direction shown in FIG. 3.

[0066] In addition, when the shape of the orthographic projection of the pole column assembly 200 and the orthographic projection outer contour of the cover plate body 100 is a circular shape, the center is the center of the circle of the orthographic projection of the pole column assembly 200 and the orthographic projection outer contour of the cover plate body 100; when the shape of the orthographic projection of the pole column assembly 200 and the orthographic projection outer contour of the cover plate body 100 is a square shape, the center is the intersection of the diagonal lines of the orthographic projection of the pole column assembly 200 and the orthographic projection outer contour of the cover plate body 100; when the shape of the orthographic projection of the pole column assembly 200 and the orthographic projection outer contour of the cover plate body 100 is a triangular shape, the center is the intersection of the three midlines of the orthographic projection of the pole column assembly 200 and the orthographic projection outer contour of the cover plate body 100.

[0067] Through the above setting, the pole post assembly 200 can leave out the central area of the cover plate body 100 in the radial direction, so that the cover plate body 100 has enough space on one side of the pole post assembly 200 in the radial direction of the cover plate body 100. Therefore, when the explosion-proof valve 300 is arranged on the side of the pole post assembly 200 close to the center of the cover plate body 100 in the radial direction of the cover plate body 100, it can ensure that there is enough space on the cover plate body 100 to arrange the explosion-proof valve 300, so as to facilitate the arrangement of the explosion-proof valve 300 with large size specifications on the cover plate body 100, improve the pressure relief capacity of the explosion-proof valve 300, and to a certain extent, ensure the smoothness of the exhaust, thereby improving the use safety of the battery monomer 3000.

[0068] That is, the focus of the present application is the structural design of the cover plate assembly 1000. While ensuring that the pole post assembly 200 and the explosion-proof valve 300 can be arranged on the cover plate body 100, the explosion-proof valve 300 affecting the safety performance of the battery monomer 3000 is preferably designed to improve the pressure relief capacity of the explosion-proof valve 300, thereby to a certain extent, ensuring the working performance of the battery monomer 3000.

[0069] In summary, the present application provides a cover plate assembly 1000 different from the current industry technology. The main technical solution is to design the pole post assembly 200 to be offset relative to the radial center of the cover plate body 100, thereby leaving out the radial center area of the cover plate body 100, which is conducive to designing the explosion-proof valve 300 with large size specifications on the cover plate body 100, replacing the existing sodium material system or large capacity type battery with a double-direction double-explosion-proof valve structure, simplifying the structure of the cover plate body 100, realizing directional and effective explosion-proof, and improving the safety performance of the battery monomer 3000.

[0070] From the above structure, it can be seen that the cover plate assembly 1000 of the battery monomer 3000 of the present application creatively sets the position of the pole post assembly 200 and adaptively adjusts the position of the explosion-proof valve 300 to realize the arrangement of the explosion-proof valve 300 with large size specifications. In this way, while simplifying the structure of the cover plate assembly 1000, the use safety of the battery monomer 3000 can also be improved.

[0071] It can be understood that, compared with the existing technology of designing a double-direction double-explosion-proof valve to improve the use safety of the battery, the cover plate assembly 1000 of the battery monomer 3000 of the present application can not only improve the use safety of the battery monomer 3000, but also simplify the structure of the cover plate assembly 1000, reduce the manufacturing cost of the cover plate assembly 1000, and be conducive to improving the manufacturing efficiency of the cover plate assembly 1000.

[0072] It should be noted that the shape of the explosion-proof valve 300 is circular in FIG. 2, and in other embodiments, the shape of the explosion-proof valve 300 can also be designed as any geometric shape such as a rectangle, a triangle, a trapezoid, a ring, or a sector according to actual process or performance requirements, and the present application does not make specific limitations.

[0073] In some embodiments, the explosion-proof valve 300 has a projection area S1 on the projection surface, and the cover plate assembly 1000 has a projection area S, wherein S1 = 0.2S-0.8S, and the units of S and S1 are the same. That is, the projection area S1 of the explosion-proof valve 300 in the plane parallel to the cover plate body 100 is 0.2-0.8 times the projection area S of the cover plate assembly 1000 in the plane parallel to the cover plate body 100. When S1 and S satisfy the above range, the area of the explosion-proof valve 300 itself can be ensured to be appropriate, the exhaust performance of the explosion-proof valve 300 is improved, thereby increasing the use safety of the battery monomer 3000 to a certain extent, and at the same time, the explosion-proof valve 300 can also occupy a more appropriate area on the cover plate body 100, and there is enough space on the cover plate body 100 to arrange the pole group assembly 200, thereby facilitating the size and installation of the pole group assembly 200.

[0074] That is, the present application sets the projection area S1 of the explosion-proof valve 300 in the direction perpendicular to the thickness of the cover plate body 100 to be 0.2-0.8 times the projection area S of the cover plate assembly 1000 in the direction perpendicular to the thickness of the cover plate body 100. While ensuring that the gas production amount when the electrolyte is instantaneously gasified can be smoothly discharged through the explosion-proof valve 300, the explosion-proof valve 300 can also occupy an appropriate space on the cover plate body 100, which is beneficial to ensuring the size of the pole group assembly 200.

[0075] It should be noted that the units of S and S1 are the same, which means that when the unit of the projection area S1 of the explosion-proof valve 300 in the direction perpendicular to the thickness of the cover plate body 100 is square centimeters, the unit of the projection area S of the cover plate assembly 1000 in the direction perpendicular to the thickness of the cover plate body 100 is also square centimeters; when the unit of the projection area S1 of the explosion-proof valve 300 in the direction perpendicular to the thickness of the cover plate body 100 is square meters, the unit of the projection area S of the cover plate assembly 1000 in the direction perpendicular to the thickness of the cover plate body 100 is also square meters.

[0076] That is, the present application preferably designs the explosion-proof valve 300 which affects the safety performance of the battery monomer 3000 to ensure 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 monomer 3000 to a certain extent.

[0077] In some embodiments, S1 = 0.2S ~ 0.5S. In order to further optimize the coverage area of the explosion-proof valve 300 on the cover plate body 100, while ensuring that the gas generated during the instantaneous gasification of the electrolyte can be smoothly discharged through the explosion-proof valve 300, and further ensuring that the explosion-proof valve 300 occupies appropriate space on the cover plate body 100, which is conducive to ensuring the size of the pole assembly 200.

[0078] In specific examples, S1 = 0.2S, 0.3S, 0.4S, 0.5S, 0.6S, 0.7S, or 0.8S, etc.

[0079] In some embodiments, on the projection plane, the minimum distance between the orthographic projection outer contour of the explosion-proof valve 300 and the center of the orthographic projection outer contour of the cover plate body 100 is a first distance, and the minimum distance between the orthographic projection outer contour of the pole assembly 200 and the center of the orthographic projection outer contour of the cover plate body 100 is a second distance, and the first distance is less than the second distance. That is, on the projection plane, the orthographic projection outer contour of the explosion-proof valve 300 and the center of the orthographic projection outer contour of the cover plate body 100 have multiple distances, and the orthographic projection outer contour of the pole assembly 200 and the center of the orthographic projection outer contour of the cover plate body 100 have multiple distances, wherein the minimum distance between the orthographic projection outer contour of the explosion-proof valve 300 and the center of the orthographic projection outer contour of the cover plate body 100 is less than the minimum distance between the orthographic projection outer contour of the pole assembly 200 and the center of the orthographic projection outer contour of the cover plate body 100. Thus, relative to the pole assembly 200, the explosion-proof valve 300 can be arranged closer to the radial center of the cover plate body 100 in the radial direction of the cover plate body 100, thereby facilitating the arrangement of a large size specification explosion-proof valve 300 on the cover plate body 100 to improve the pressure relief capacity of the explosion-proof valve 300, thereby improving the use safety of the battery monomer 3000.

[0080] It should be noted that the minimum distance between the orthographic projection outer contour of the explosion-proof valve 300 and the center of the orthographic projection outer contour of the cover plate body 100 refers to that, on the projection plane, the orthographic projection outer contour of the explosion-proof valve 300 and the center of the orthographic projection outer contour of the cover plate body 100 have multiple distances, and the closest distance between the orthographic projection outer contour of the explosion-proof valve 300 and the center of the orthographic projection outer contour of the cover plate body 100 is defined as the minimum distance between the orthographic projection outer contour of the explosion-proof valve 300 and the center of the orthographic projection outer contour of the cover plate body 100.

[0081] Correspondingly, the minimum distance between the outer projection contour of the pole post assembly 200 and the center of the outer projection contour of the cover plate body 100 refers to that, on the projection plane, the outer projection contour of the pole post assembly 200 and the center of the outer projection contour of the cover plate body 100 have multiple distances, and the nearest distance between the outer projection contour of the pole post assembly 200 and the center of the outer projection contour of the cover plate body 100 is defined as the minimum distance between the outer projection contour of the pole post assembly 200 and the center of the outer projection contour of the cover plate body 100.

[0082] In the description of the present application, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features, for distinguishing the description features, without order and without difference.

[0083] In some embodiments, as shown in FIG. 1, FIG. 2 and FIG. 3, on the projection plane, the outer projection contour of the explosion-proof valve 300 covers the center of the outer projection contour of the cover plate body 100. Here, it can also be understood that, on the projection plane, the center of the outer projection contour of the cover plate body 100 is located within the outer projection contour of the explosion-proof valve 300, so that the explosion-proof valve 300 can be arranged closer to the center of the cover plate body 100 in the radial direction of the cover plate body 100, which is beneficial to arranging the explosion-proof valve 300 of large size specification by using the space on the cover plate body 100, thereby improving the pressure relief capacity of the explosion-proof valve 300.

[0084] In some embodiments, as shown in FIG. 1, FIG. 2 and FIG. 3, on the projection plane, the center of the outer projection contour of the explosion-proof valve 300 is arranged apart from the center of the outer projection contour of the cover plate body 100. In this way, the radial center of the explosion-proof valve 300 can be arranged offset from the radial center of the cover plate body 100 in the axial direction of the cover plate body 100, so that the explosion-proof valve 300 can be offset relative to the radial center of the cover plate body 100, which is beneficial to providing space for arranging the pole post assembly 200, so that the pole post assembly 200 can be effectively arranged on the cover plate body 100, and the fixing difficulty of the pole post assembly 200 is reduced.

[0085] That is to say, in the radial direction of the cover plate body 100, the explosion-proof valve 300 and the pole post assembly 200 on the cover plate assembly 1000 of the present application are both arranged offset from the radial center of the cover plate body 100, so as to rationally utilize the space on the cover plate body 100, and while ensuring that the explosion-proof valve 300 and the pole post assembly 200 can be arranged on the cover plate body 100, the explosion-proof valve 300 of large size specification can also be arranged, and the pressure relief capacity of the explosion-proof valve 300 is improved, thereby improving the use safety of the battery monomer 3000.

[0086] In some embodiments, as shown in FIG. 1, FIG. 2 and FIG. 3, in the radial direction of the cover plate body 100, the outer contour of the explosion-proof valve 300 is spaced apart from the outer edge of the cover plate body 100. It should be noted that, because the explosion-proof valve 300 needs to be arranged on the cover plate body 100 through the mounting hole (the through hole 110 in the following), by spacing the outer contour of the explosion-proof valve 300 from the outer edge of the cover plate body 100, the mounting hole can be spaced apart from the outer edge of the cover plate body 100, thereby to some extent avoiding damage to the cover plate body 100 in the process of opening the mounting hole, prolonging the service life of the cover plate body 100, and also improving the structural strength of the cover plate body 100.

[0087] In some embodiments, on the projection plane, the minimum distance between the outer contour of the explosion-proof valve 300 and the outer contour of the cover plate body 100 is in the range of 3mm to 10mm. Here, it can also be understood that, on the plane parallel to the cover plate body 100, the explosion-proof valve 300 has multiple distances with the outer contour of the cover plate body 100, and the minimum distance is in the range of 3mm to 10mm. It can also be understood that, on the plane parallel to the cover plate body 100, the minimum distance between the outer contour of the through hole 110 and the outer contour of the cover plate body 100 is in the range of 3mm to 10mm.

[0088] Therefore, the minimum distance between the outer contour of the explosion-proof valve 300 and the outer contour of the cover plate body 100 on the projection plane mentioned above can be understood as L1 shown in FIG. 1. When L1 is kept in a suitable range, the structural strength of the cover plate body 100 can be guaranteed, and the explosion-proof valve 300 can occupy a suitable space on the cover plate body 100, so that there is enough space on the cover plate body 100 to arrange the pole assembly 200, and the size and installation of the pole assembly 200 can be guaranteed.

[0089] That is, the minimum distance L1 between the outer contour of the explosion-proof valve 300 and the outer contour of the cover plate body 100 on the projection plane is set to be in the range of 3mm to 10mm, so that the structural strength of the cover plate body 100 can be guaranteed, and the explosion-proof valve 300 can occupy a suitable space on the cover plate body 100, so that there is enough space on the cover plate body 100 to arrange the pole assembly 200, which is beneficial to guarantee the size of the pole assembly 200, improve the working performance of the pole assembly 200, and reduce the installation difficulty of the pole assembly 200.

[0090] In a specific example, on the projection plane, the minimum distance between the outer contour of the explosion-proof valve 300 and the outer contour of the cover plate body 100 is 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.

[0091] In some embodiments, on the projection plane, the distance between any two points on the outer contour of the normal projection of the explosion-proof valve 300 is a radial distance, and the maximum radial distance of the explosion-proof valve 300 ranges from 6 mm to 30 mm. Here, it is referred to that, on the projection plane, when the normal projection of the explosion-proof valve 300 has multiple radial distances, the maximum radial distance ranges from 6 mm to 30 mm, so that the size of the explosion-proof valve 300 ranges from 6 mm to 30 mm.

[0092] When the maximum radial distance of the explosion-proof valve 300 is designed in the above range, on the one hand, the area of the explosion-proof valve 300 is appropriate, and the exhaust performance of the explosion-proof valve 300 is improved, thereby improving the use safety of the battery monomer 3000; on the other hand, the occupied area of the explosion-proof valve 300 is appropriate, and there is enough space on the cover plate body 100 to arrange the pole assembly 200, so as to ensure the size and installation of the pole assembly 200.

[0093] Therefore, the maximum radial distance of the explosion-proof valve 300 is set to range from 6 mm to 30 mm, so that the gas production amount when the electrolyte is instantaneously gasified can be smoothly discharged through the explosion-proof valve 300, and at the same time, the explosion-proof valve 300 occupies appropriate space on the cover plate body 100, which is beneficial to ensure the size of the pole assembly 200, improve the working performance of the pole assembly 200, and reduce the installation difficulty of the pole assembly 200.

[0094] In specific examples, the maximum radial distance of the explosion-proof valve 300 is 6 mm, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm, etc.

[0095] It should be noted that the maximum radial distance of the explosion-proof valve 300 can be understood as L2 shown in FIG. 1.

[0096] 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.

[0097] Of course, in other embodiments, the maximum radial distance of the explosion-proof valve 300 can also be adjusted according to the material system of the battery monomer 3000, the diameter of the pole core, the capacity of the battery monomer 3000, or the weight of the electrolyte of the battery monomer 3000, and is not limited to be set to the above 6 mm to 30 mm.

[0098] In some embodiments, as shown in FIGS. 2 and 3, the explosion-proof valve 300 includes an explosion-proof valve body 320 and a protective sheet 400, the cover plate body 100 includes a first surface 130 and a second surface 140, the first surface 130 and the second surface 140 are oppositely arranged along the thickness direction of the cover plate body 100, the cover plate body 100 is provided with a through hole 110 penetrating through the first surface 130 and the second surface 140, the explosion-proof valve body 320 covers the opening of the through hole 110 towards the first surface 130, and the protective sheet 400 covers the opening of the through hole 110 towards the second surface 140. Here, the thickness direction of the cover plate body 100 can be understood as the X direction shown in FIG. 3, that is, the axial direction of the cover plate body 100.

[0099] That is, the cover plate body 100 includes a first surface 130 and a second surface 140 oppositely arranged along the axial direction of the cover plate body 100, and the cover plate body 100 is further provided with a through hole 110 penetrating through the first surface 130 and the second surface 140, so that the through hole 110 penetrates through the cover plate body 100 in the axial direction of the cover plate body 100. After the through hole 110 is formed, the through hole 110 has an opening towards the first surface 130 and an opening towards the second surface 140. By covering the opening of the through hole 110 towards the first surface 130 with the explosion-proof valve body 320 and covering the opening of the through hole 110 towards the second surface 140 with the protective sheet 400, the through hole 110 can be covered by the explosion-proof valve 300. Not only can the use safety of the battery monomer 3000 be improved by using the explosion-proof valve 300, but also the external foreign matters can be prevented from entering the battery monomer 3000 through the through hole 110, thereby ensuring the working performance of the battery monomer 3000 to a certain extent.

[0100] In some embodiments, as shown in FIGS. 2 and 3, the explosion-proof valve body 320 is arranged at the opening of the through hole 110 towards the first surface 130, so as to arrange the explosion-proof valve body 320 on the cover plate body 100, thereby facilitating the cover plate body 100 to support the explosion-proof valve body 320, improving the position stability of the explosion-proof valve body 320, and reducing the matching difficulty of the explosion-proof valve body 320 and the cover plate body 100.

[0101] Optionally, the explosion-proof valve body 320 is connected to the opening of the through hole 110 towards the first surface 130 by laser welding fusion, so as to not only reduce the matching difficulty of the explosion-proof valve body 320 and the cover plate body 100, but also ensure the connection strength of the explosion-proof valve body 320 and the cover plate body 100, improve the position stability of the explosion-proof valve body 320, and thereby ensure the working performance of the explosion-proof valve body 320.

[0102] It should be noted that the explosion-proof valve body 320 needs to be ensured to have no virtual welding or welding hole after laser welding, and has the design required airtightness.

[0103] In some embodiments, as shown in FIGS. 2 and 3, the protective sheet 400 is arranged at the opening of the through hole 110 towards the second surface 140, so as to arrange the protective sheet 400 on the cover plate body 100 and arrange the explosion-proof valve body 320 at opposite ends of the through hole 110, so as to protect the explosion-proof valve body 320 by the protective sheet 400, avoid external foreign matters from falling to the explosion-proof valve body 320 to damage the explosion-proof valve body 320, ensure the working performance of the explosion-proof valve body 320, ensure that the explosion-proof valve body 320 can effectively realize the rapid exhaust pressure relief of the battery monomer 3000, play the explosion-proof role, and to a certain extent, solve the technical problem of the explosion of the battery monomer 3000.

[0104] Optionally, the protective sheet 400 is made of rubber, so as to ensure that the protective sheet 400 can be dissolved after being 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, so as to exhaust the gas through the through hole 110, and ensure the use safety of the battery monomer 3000.

[0105] In some embodiments, as shown in FIGS. 1 and 2, the explosion-proof valve body 320 is provided with a thinning area 310, and the thickness of the thinning area 310 is 0.15mm-0.7mm. So as to ensure that when the internal pressure of the battery monomer 3000 is large, the explosion-proof valve body 320 can be effectively broken, so as to exhaust the gas in the battery monomer 3000 through the explosion-proof valve 300, so as to achieve the effect of pressure relief and explosion-proof, and ensure the working performance of the explosion-proof valve 300.

[0106] In some embodiments, a thinning and marking structure can be arranged on the explosion-proof valve body 320, so as to form the thinning area 310 on the explosion-proof valve body 320, thereby ensuring the working performance of the explosion-proof valve 300.

[0107] The shape of the thinning area 310 can be circular, annular, or any geometric shape such as geometric intersection.

[0108] It should be noted that the thickness of the thinning area 310 can be understood as the thickness of the part of the structure of the explosion-proof valve body 320 after being thinned. When the thickness of the thinning area 310 is thin, the structural strength of the explosion-proof valve body 320 is reduced, and the service life of the explosion-proof valve body 320 is shortened. When the thickness of the thinning area 310 is thick, when the internal pressure of the battery monomer 3000 is large, the explosion-proof valve body 320 cannot be effectively broken, and the use safety of the battery monomer 3000 is reduced.

[0109] Therefore, the thickness of the thinning area 310 is set to 0.15mm-0.7mm, so that the structural strength of the explosion-proof valve body 320 is ensured, and when the internal pressure of the battery monomer 3000 is large, the explosion-proof valve body 320 can be effectively broken, so that the gas in the battery monomer 3000 is discharged through the explosion-proof valve 300, to achieve the effect of pressure relief and explosion prevention, and to improve the use safety of the battery monomer 3000.

[0110] In specific examples, the thickness of the thinning area 310 is 0.15mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm or 0.7mm, etc.

[0111] Of course, in other embodiments, the thickness of the thinning area 310 can also be determined according to the explosion pressure designed for each type of battery monomer 3000.

[0112] In some embodiments, the protective sheet 400 is adhesively fixed to the second surface 140. In this way, while achieving the fixation of the protective sheet 400 to the cover body 100, the connection between the protective sheet 400 and the cover body 100 can be dissolved by heat when the heat dissipation gas is discharged, so as to facilitate the gas discharge, and further ensure the use safety of the battery monomer 3000.

[0113] In some embodiments, the thickness of the protective sheet 400 is in the range of 0.2mm-0.7mm. Here, the thickness of the protective sheet 400 can be understood as T shown in FIG. 3. When the thickness of the protective sheet 400 is designed to be in the above range, the working performance of the protective sheet 400 is further improved, so that the protective sheet 400 effectively protects the explosion-proof valve body 320, and is beneficial to the dissolution of the protective sheet 400 when heated, thereby improving the gas discharge effect.

[0114] Therefore, the thickness of the protective sheet 400 is set to 0.2mm-0.7mm, so that the working performance of the protective sheet 400 is ensured, and the protective sheet 400 can be dissolved after being heated, so as to facilitate the gas discharge.

[0115] In specific examples, the thickness of the protective sheet 400 is 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm or 0.7mm, etc.

[0116] In some embodiments, as shown in FIG. 1, FIG. 2 and FIG. 3, the pole assembly 200 is spaced apart from the explosion-proof valve 300 and the outer edge of the cover plate body 100 in the radial direction of the cover plate body 100. Since the pole assembly 200 is arranged on the cover plate body 100 through the mounting hole (the first communication hole 120 as described below), by spacing apart the pole assembly 200 from the explosion-proof valve 300 and the outer edge of the cover plate body 100 in the radial direction of the cover plate body 100, the first communication hole 120 can be spaced apart from the outer edge of the cover plate body 100, thereby avoiding damage to the cover plate body 100 to some extent during the process of opening the first communication hole 120, prolonging the service life of the cover plate body 100, and also improving the structural strength of the cover plate body 100, and avoiding damage to the explosion-proof valve 300 during assembly of the pole assembly 200, so as to ensure the working performance of the explosion-proof valve 300.

[0117] That is, by spacing apart the pole assembly 200 from the explosion-proof valve 300 and the outer edge of the cover plate body 100 in the radial direction of the cover plate body 100, the structural strength of the cover plate body 100 can be ensured, and the working performance of the explosion-proof valve 300 can also be ensured.

[0118] In some embodiments, the minimum distance between the outer contour of the pole assembly 200 and the outer contour of the explosion-proof valve 300 in the projection plane is in the range of 5mm to 15mm. Here, it is meant that in the plane parallel to the cover plate body 100, there are multiple distances between the outer contour of the pole assembly 200 and the outer contour of the explosion-proof valve 300, and the minimum distance is in the range of 5mm to 15mm. It can also be understood that in the plane parallel to the cover plate body 100, the minimum distance between the outer contour of the first communication hole 120 and the outer contour of the through hole 110 is in the range of 5mm to 15mm.

[0119] Therefore, the minimum distance between the outer contour of the pole assembly 200 and the outer contour of the explosion-proof valve 300 in the projection plane as described above can be understood as L3 shown in FIG. 1. When L3 is designed to be a suitable size, the assembly of the pole assembly 200 and the explosion-proof valve 300 is facilitated, the working performance of the pole assembly 200 and the explosion-proof valve 300 is further improved, a large-sized explosion-proof valve 300 can be provided, and on the other hand, a suitable distance between the pole assembly 200 and the outer edge of the cover plate body 100 can be provided, so as to ensure the structural strength of the cover plate body 100.

[0120] That is to say, the present application sets the minimum distance L3 between the orthogonal projection outer contour of the pole assembly 200 and the orthogonal projection outer contour of the explosion-proof valve 300 on the projection plane to a range of 5mm-15mm, so that the structural strength of the cover plate body 100 is ensured, while the explosion-proof valve 300 is prevented from being damaged during assembly of the pole assembly 200, the working performance of the explosion-proof valve 300 is ensured, and a large-size specification of the explosion-proof valve 300 is facilitated, thereby improving the use safety of the battery monomer 3000.

[0121] In a specific example, the minimum distance between the orthogonal projection outer contour of the pole assembly 200 and the orthogonal projection outer contour of the explosion-proof valve 300 on the projection plane is 5mm, 8mm, 10mm, 12mm or 15mm, etc.

[0122] Alternatively, the minimum distance between the orthogonal projection outer contour of the pole assembly 200 and the orthogonal projection outer contour of the cover plate body 100 on the projection plane is in a range of 3mm-10mm. Here, it is meant that on a plane parallel to the cover plate body 100, there are multiple distances between the orthogonal projection outer contour of the pole assembly 200 and the orthogonal projection outer contour of the cover plate body 100, and the nearest distance is in a range of 3mm-10mm, which can also be understood as the minimum distance between the orthogonal projection outer contour of the first communication hole 120 and the orthogonal projection outer contour of the cover plate body 100 on a plane parallel to the cover plate body 100 being in a range of 3mm-10mm.

[0123] Therefore, the minimum distance between the orthogonal projection outer contour of the pole assembly 200 and the orthogonal projection outer contour of the cover plate body 100 on the projection plane mentioned above can be understood as L4 shown in FIG. 1. When L4 is designed to be of an appropriate size, the distance between the first communication hole 120 and the outer edge of the cover plate body 100 is appropriate, the structural strength of the cover plate body 100 is improved, and the pole assembly 200 occupies appropriate space on the cover plate body 100, so that there is sufficient space on the cover plate body 100 to arrange the explosion-proof valve 300 and other structural members, which facilitates the setting of a large-size specification of the explosion-proof valve 300 and improves the use safety of the battery monomer 3000.

[0124] That is to say, the present application sets the minimum distance L4 between the orthogonal projection outer contour of the pole assembly 200 and the orthogonal projection outer contour of the cover plate body 100 on the projection plane to a range of 3mm-10mm, so that the structural strength of the cover plate body 100 is ensured, and the pole assembly 200 occupies appropriate space on the cover plate body 100, so that there is sufficient space on the cover plate body 100 to arrange the explosion-proof valve 300, which facilitates the setting of a large-size specification of the explosion-proof valve 300, improves the working performance of the explosion-proof valve 300, and improves the use safety of the battery monomer 3000.

[0125] In a specific example, the minimum distance between the outer contour of the front projection of the pole assembly 200 and the outer contour of the front projection of the cover plate body 100 on the projection surface is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, etc.

[0126] In some embodiments, as shown in FIGS. 1, 5, 6, and 7, the outer shape of the pole assembly 200 can be any closed geometric shape such as a ring, a rectangle, a sector, an arc, or a circle, and the present application does not make specific limitations.

[0127] In some embodiments, as shown in FIGS. 2 and 3, the cover plate body 100 includes a first surface 130 and a second surface 140, which are oppositely arranged along the thickness direction of the cover plate body 100. The cover plate body 100 is provided with a first communication hole 120 penetrating the first surface 130 and the second surface 140, and the pole assembly 200 is arranged in the first communication hole 120. Here, it is meant that the cover plate body 100 includes the first surface 130 and the second surface 140 oppositely arranged in the axial direction of the cover plate body 100. The cover plate body 100 is further provided with the first communication hole 120 penetrating the first surface 130 and the second surface 140, so that the first communication hole 120 penetrates the cover plate body 100 in the axial direction of the cover plate body 100. By arranging the pole assembly 200 in the first communication hole 120, the pole assembly 200 can be arranged on the cover plate body 100, thereby facilitating the support of the pole assembly 200 by the cover plate body 100, improving the positional stability of the pole assembly 200, and reducing the difficulty of cooperation between the pole assembly 200 and the cover plate body 100.

[0128] In some embodiments, as shown in FIG. 3 and FIG. 4, the pole assembly 200 includes a first pole 210 and a second pole 220, the first pole 210 is connected with the second surface 140, the second pole 220 includes a connecting cylinder 221 and a connecting plate 222, the connecting plate 222 is connected with the first surface 130, the connecting cylinder 221 passes through the first communication hole 120 to connect the first pole 210 and the connecting plate 222, the connecting plate 222 is adapted to be electrically connected with the pole core, the first pole 210 is provided with a avoiding hole 211 opening towards the connecting cylinder 221, and the connecting cylinder 221 is connected with the first pole 210 through the avoiding hole 211. Here, the connecting plate 222 of the first pole 210 and the second pole 220 is respectively arranged on the opposite sides of the cover plate body 100, and because the first pole 210 is provided with the avoiding hole 211 opening towards the connecting cylinder 221, the connecting cylinder 221 of the second pole 220 can effectively pass through the first communication hole 120 of the cover plate body 100 and the avoiding hole 211 of the first pole 210 to connect the first pole 210 and the connecting plate 222, so as to realize the electrical connection between the first pole 210 and the connecting plate 222. Thus, when the connecting plate 222 is electrically connected with the pole core, the current of the pole core can be led out by the first pole 210 to ensure the working performance of the pole core and reduce the electrical connection difficulty between the pole core and the external structure.

[0129] The above can also be understood as that the second pole 220 is provided as the connecting cylinder 221 and the connecting plate 222, the connecting plate 222 is mainly used for electrical connection with the pole core, and the connecting cylinder 221 is used for realizing the fixed connection between the second pole 220 and the first pole 210, so as to realize the fixed connection between the pole core and the first pole 210, and facilitate the current of the pole core to be led out by the first pole 210 to ensure the working performance of the pole core.

[0130] In some embodiments, the connecting cylinder 221 is formed as a hollow piece to facilitate the electrical connection between the connecting plate 222 and the pole core, reduce the connection difficulty between the connecting plate 222 and the pole core, and further reduce the connection difficulty between the pole assembly 200 and the pole core.

[0131] In a specific example, because the connecting cylinder 221 is formed as a hollow piece, in the process of connecting the pole assembly 200 with the pole core, the connecting tool can pass through the connecting cylinder 221 and act on the connecting plate 222, so as to facilitate the electrical connection between the connecting plate 222 and the pole core.

[0132] In addition, by providing the avoiding hole 211 on the first pole 210 to communicate with the connecting cylinder 221, the connecting cylinder 221 can pass through the first pole 210, so that the connecting cylinder 221 can be connected with the first pole 210, and the connection difficulty between the connecting cylinder 221 and the first pole 210 is reduced.

[0133] It is also worth noting that, compared with the prior art, the pole assembly 200 is composed of the first pole 210 and the second pole 220, which can reduce the assembly difficulty of the pole assembly 200 and the cover plate body 100, so that the pole assembly 200 is convenient to assemble, thereby enabling the pole assembly 200 to be effectively arranged on the opposite sides of the cover plate body 100, and also facilitating separate processing of the first pole 210, ensuring that the first pole 210 has a large enough welding surface and flatness, and facilitating the use of the first pole 210 and the second pole 220 to simultaneously extrude the insulating seal 500 (the specific structure of the insulating seal 500 can be seen from FIG. 4) arranged between the pole assembly 200 and the cover plate body 100 during assembly of the first pole 210 and the second pole 220, to ensure the sealing effect of the insulating seal 500.

[0134] In some embodiments, as shown in FIG. 4, the avoiding 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 communicated, the hole diameter of the first hole section is smaller than that of the second hole section to define a step surface 212, the connecting cylinder 221 includes a cylinder portion 2211 and a limiting portion 2212, the limiting portion 2212 is connected with the cylinder portion 2211, the limiting portion 2212 is arranged on one side of the cylinder portion 2211 in the axial direction, and the limiting portion 2212 is placed on the step surface 212 and fixedly connected with the first pole 210. In this way, the fixed connection of the connecting cylinder 221 and the first pole 210 is realized, and the connection difficulty of the connecting cylinder 221 and the first pole 210 is reduced, and the connection strength of the connecting cylinder 221 and the first pole 210 is ensured, so that the first pole 210 and the second pole 220 are fixedly connected.

[0135] It should be noted that, by setting the hole diameter of the first hole section to be smaller than that of the second hole section, a concave groove is arranged on the inner peripheral wall of the first pole 210, thereby forming the step surface 212, which facilitates the fixed connection of the first pole 210 and the second pole 220.

[0136] In some embodiments, the limiting portion 2212 of the connecting cylinder 221 is riveted and fixed with the first pole 210, so as to ensure the connection strength of the connecting cylinder 221 and the first pole 210, and also facilitate the use of the connecting cylinder 221 and the first pole 210 to compress the insulating seal 500, thereby further ensuring the sealing effect of the insulating seal 500.

[0137] In some embodiments, as shown in FIGS. 2 and 8, the connecting cylinder 221 and the connecting plate 222 are an integral piece or separate pieces. That is, the connecting cylinder 221 and the connecting plate 222 can be formed by an integral molding process, or the connecting cylinder 221 and the connecting plate 222 can be separately processed, and then the connecting cylinder 221 and the connecting plate 222 are assembled to form the second pole column 220.

[0138] In some embodiments, as shown in FIG. 2, the second pole column 220 can be processed by a cold heading forming process, so that the connecting cylinder 221 and the connecting plate 222 are formed as an integral piece, thereby eliminating the connection between the connecting cylinder 221 and the connecting plate 222, reducing the processing difficulty of the second pole column 220, and improving the forming efficiency of the second pole column 220.

[0139] In other embodiments, as shown in FIGS. 8, 9 and 10, the connecting cylinder 221 and the connecting plate 222 are separate pieces, and the connecting cylinder 221 and the connecting plate 222 can be formed by a stamping forming process, and then the connecting cylinder 221 and the connecting plate 222 are welded to form the second pole column 220. Since the stamping forming process has low production cost, the above arrangement can effectively reduce the manufacturing cost of the second pole column 220.

[0140] Alternatively, the connecting cylinder 221 and the connecting plate 222 are assembled into the second pole column 220 by continuous laser penetration welding, to ensure the connection strength of the connecting cylinder 221 and the connecting plate 222.

[0141] In some embodiments, as shown in FIGS. 2, 3 and 4, the pole column assembly 200 further includes a pole column cover plate 230, which is connected to the first pole column 210 to cover the escape hole 211. In this way, while avoiding the entry of external foreign matter into the escape hole 211, the pole column cover plate 230 can also be used to electrically connect the pole column assembly 200 to external structural components (such as busbars), thereby facilitating electrical connection between multiple battery monomers 3000.

[0142] In a specific example, during assembly of the battery monomer 3000, the connecting plate 222 is first connected to the pole core through the connecting cylinder 221, and then the pole column cover plate 230 is connected to the first pole column 210 to cover the escape hole 211 and increase the connection area of the pole column assembly 200 to external structural components, thereby ensuring the stability of the connection.

[0143] Alternatively, the pole column cover plate 230 is welded to the first pole column 210 to increase the connection strength of the pole column cover plate 230 and the first pole column 210, so that the relative position of the pole column cover plate 230 and the first pole column 210 is stable.

[0144] Of course, in other embodiments, if the size of the first pole post 210 meets the welding surface requirement when the plurality of battery monomers 3000 are assembled, the pole post cover plate 230 can also not be arranged to simplify the structure of the pole post assembly 200 and reduce the manufacturing difficulty and manufacturing cost of the pole post assembly 200.

[0145] In some embodiments, as shown in combination with FIG. 4 and FIG. 10, the cover plate assembly 1000 further comprises an insulating seal 500 arranged between the pole post assembly 200 and the cover plate body 100. So that the pole post assembly 200 and the cover plate body 100 form an insulating and sealing fit, thereby avoiding the pole post assembly 200 and the cover plate body 100 form an electrical connection, to ensure the working performance of the battery monomer 3000.

[0146] In some embodiments, when the first pole post 210 and the second pole post 220 are connected, the insulating seal 500 can be compressed, thereby forming the insulation and sealing of the pole post assembly 200 and the cover plate body 100, and ensuring the sealing effect of the insulating seal 500.

[0147] Optionally, as shown in combination with FIG. 2, FIG. 3 and FIG. 4, the insulating seal 500 comprises an insulating piece 510 and a seal 520, which are arranged on opposite sides of the cover plate body 100, so as to realize the arrangement of the insulating seal 500 between the pole post assembly 200 and the cover plate body 100, thereby realizing the insulating and sealing fit of the cover plate body 100 and the pole post assembly 200, and reducing the installation difficulty of the insulating seal 500 and the cover plate body 100.

[0148] In some embodiments, as shown in combination with FIG. 2, FIG. 3 and FIG. 4, the insulating piece 510 is arranged on the outside of the cover plate body 100, and the seal 520 is arranged on the inside of the cover plate body 100. The insulating piece 510 is made of high-performance thermoplastic resin injection molding, such as polyphenylene sulfide, to ensure the insulation performance of the insulating piece 510, so that the cover plate body 100 and the pole post assembly 200 can effectively form an insulating interval; the seal 520 is made of fluorine rubber, ethylene-propylene-diene rubber or meltable polytetrafluoroethylene, so that the seal 520 has certain sealing performance while ensuring the insulation performance of the seal 520, thereby providing sealing function for the pole post assembly 200, and avoiding the electrolyte in the battery monomer 3000 from overflowing, to ensure the working performance of the battery monomer 3000.

[0149] In some embodiments, as shown in FIGS. 8 and 10, the insulation piece 510 includes an insulation portion 511 and a sealing portion 512, the sealing portion 512 is arranged opposite to the sealing piece 520, and the insulation portion 511 is arranged at the outer periphery of the sealing portion 512, so that the insulation piece 510 has an insulation sealing effect, which can further prevent the electrolyte in the battery monomer 3000 from overflowing, and ensure the working performance of the battery monomer 3000 while ensuring the insulation cooperation between the cover plate body 100 and the pole assembly 200.

[0150] In some embodiments, as shown in FIGS. 4 and 10, the insulation sealing piece 500 is clamped between the first pole 210 and the connecting plate 222. In this way, the assembly difficulty of the insulation sealing piece 500 can be reduced while achieving the insulation sealing cooperation between the pole assembly 200 and the cover plate body 100, and the first pole 210 and the second pole 220 can be used to press the insulation sealing piece 500, so as to improve the sealing effect of the insulation sealing piece 500.

[0151] The battery monomer 3000 of the embodiments of the present application is described below.

[0152] As shown in FIGS. 2 and 8, a battery monomer 3000 according to an embodiment of the present application includes a shell, a pole core, and a cover plate assembly 1000.

[0153] The shell has an accommodating cavity with an opening, and the pole core is arranged in the accommodating cavity. In this way, the pole core is arranged in the shell, which can protect the pole core, prolong the service life of the pole core, and improve the use safety of the pole core.

[0154] As shown in FIGS. 2, 3, and 4, 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 herein. The cover plate assembly 1000 is arranged at the opening. In this way, the opening of the shell can be blocked by the cover plate assembly 1000, and the cover plate assembly 1000 can be arranged opposite to the pole core, so as to realize the electrical connection between the pole assembly 200 of the cover plate assembly 1000 and the pole core, and ensure the working performance of the pole core.

[0155] Meanwhile, since the aforementioned cover plate assembly 1000 can be provided with a large-size explosion-proof valve 300, the battery monomer 3000 according to the embodiments of the present application can effectively improve the use safety of the battery monomer 3000 by using the aforementioned cover plate assembly 1000.

[0156] In some embodiments, the shell is formed by stamping or welding, and the shell is made of aluminum or steel.

[0157] In some embodiments, the current collector plate 2000 is arranged 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 collector plate 2000. Thus, the pole core and the pole assembly 200 are electrically connected, and the connection difficulty of the pole core and the pole assembly 200 is reduced.

[0158] In some embodiments, the current collector plate 2000 is welded to the pole core and the pole assembly 200 respectively. Thus, the pole core and the pole assembly 200 are electrically connected, the connection strength of the pole core and the pole assembly 200 is ensured, the connection difficulty of the pole core and the pole assembly 200 is reduced, the assembly efficiency of the battery monomer 3000 is improved, and the structural stability is improved.

[0159] In some embodiments, as shown in FIGS. 2, 3 and 4, the current collector plate 2000 is provided with a connecting protrusion 2010 protruding towards the pole assembly 200, and the pole assembly 200 is connected to the connecting protrusion 2010. Thus, the pole assembly 200 and the current collector plate 2000 are connected, the connection difficulty of the pole assembly 200 and the current collector plate 2000 is reduced, the electrical connection difficulty of the pole assembly 200 and the pole core is reduced, and the working performance of the pole core is ensured.

[0160] Meanwhile, by arranging the connecting protrusion 2010 protruding towards the pole assembly 200 on the current collector plate 2000, on one hand, a buffer is formed during the connection of the current collector plate 2000 and the pole assembly 200, so that the contact area of the current collector plate 2000 and the pole assembly 200 is ensured, the connection strength is improved, and on the other hand, the process of forming the lead-out piece is omitted. Thus, the manufacturing process of the current collector plate 2000 is simplified, the manufacturing cost of the current collector plate 2000 is reduced, the manufacturing cost of the battery monomer 3000 is reduced, the pole core is not damaged during the connection of the pole assembly 200 and the current collector plate 2000, and the performance of the pole core is ensured.

[0161] In some embodiments, the connecting plate 222 of the pole assembly 200 and the connecting protrusion 2010 of the current collector plate 2000 are penetrated and welded. Thus, the pole assembly 200 and the current collector plate 2000 are connected, the connection strength of the pole assembly 200 and the current collector plate 2000 is ensured, and the connection difficulty of the pole assembly 200 and the current collector plate 2000 is reduced.

[0162] In a specific example, when the pole assembly 200 and the current collector 2000 need to be connected, the position of the connecting protrusion 2010 of the current collector 2000 can be first identified by a CCD (Charge Coupled Device) camera, and then the angle of the cover plate assembly 1000 can be corrected to correspond and assemble the connecting plate 222 of the pole assembly 200 with the connecting protrusion 2010 of the current collector 2000, so as to ensure the close fit of the connecting plate 222 and the connecting protrusion 2010. Finally, the welding tool is passed through the connecting cylinder 221 to act on the connecting plate 222, so as to facilitate the penetration welding of the connecting plate 222 and the connecting protrusion 2010, and ensure the connection quality.

[0163] In addition, since the welding surface of the current collector 2000 of the application is the connecting protrusion 2010 formed directly on the current collector 2000, the current carrying capacity of the current collector 2000 can be ensured, and the performance requirements of high rate charge and discharge can be realized.

[0164] In some embodiments, as shown in FIGS. 2 and 11, the connecting protrusion 2010 is a bridge formed on the current collector 2000, so that the connecting protrusion 2010 can protrude towards the pole assembly 200 while also serving as a buffer to ensure the contact area of the current collector 2000 and the pole assembly 200 and improve the connection strength.

[0165] Of course, in other embodiments, as shown in FIGS. 8 and 12, the connecting protrusion 2010 can also be formed by stamping the local structure of the current collector 2000.

[0166] In some embodiments, the battery monomer 3000 is formed as a cylindrical battery, and the central hole is provided in the middle of the pole core; at least part of the explosion-proof valve 300 is arranged opposite to the central hole in the thickness direction of the cover plate body 100. Since the central hole of the pole core has a certain size, after the battery monomer 3000 is injected with electrolyte, part of the electrolyte will remain in the central hole of the pole core. When the battery monomer 3000 occurs thermal runaway, the thermal decomposition of the electrolyte in the central hole will release a large amount of gas. By arranging at least part of the explosion-proof valve 300 opposite to the central hole, the large amount of gas in the central hole can be quickly discharged, so that the gas in the battery monomer 3000 can be quickly discharged, and the use safety of the battery monomer 3000 is improved.

[0167] In some embodiments, the battery cell 3000 is formed as a cylindrical battery, the middle part of the pole core has a center hole; the explosion-proof valve 300 is arranged opposite to part of the center hole in the thickness direction of the cover plate body 100. Here, it is referred to that, in the thickness direction of the cover plate body 100, not the whole structure of the center hole is opposite to the explosion-proof valve 300, but part of the structure of the center hole is opposite to the explosion-proof valve 300, so that the explosion-proof valve 300 can be arranged offset to the center of the cover plate body 100, while avoiding that the explosion-proof valve 300 occupies too much space on the cover plate body 100, the pole assembly 200 and the explosion-proof valve 300 can have a certain distance, and a large amount of gas in the center hole can be quickly discharged.

[0168] Optionally, as shown in FIGS. 2, 3 and 10, the current collecting disc 2000 is provided with a second communication hole 2020 opposite to the center hole, so as to realize the communication between the center hole and the explosion-proof valve 300, to a certain extent, avoid the current collecting disc 2000 hindering the discharge of the gas in the center hole, so as to ensure that a large amount of gas in the center hole can be effectively discharged through the explosion-proof valve 300 quickly, and improve the use safety of the battery cell 3000.

[0169] The battery pack 4000 according to the embodiments of the present application is described below.

[0170] As shown in FIG. 13, the battery pack 4000 according to the embodiments of the present application comprises a plurality of battery cells 3000.

[0171] The battery cell 3000 is the aforementioned battery cell 3000, and the specific structure of the battery cell 3000 is not described herein again.

[0172] It should be noted that, since the aforementioned battery cell 3000 is provided with the cover plate assembly 1000, the battery pack 4000 according to the embodiments of the present application can effectively improve the use safety of the battery pack 4000 by using the aforementioned battery cell 3000.

[0173] In the description of the present application, unless otherwise specified, the meaning of “a plurality of” is two or more.

[0174] The electric device 5000 according to the embodiments of the present application is described below.

[0175] As shown in FIG. 13, the electric device 5000 according to the embodiments of the present application comprises a battery cell 3000 or a battery pack 4000.

[0176] The battery cell 3000 is the aforementioned battery cell 3000, and the specific structure of the battery cell 3000 is not described herein again, and the battery pack 4000 is the aforementioned battery pack 4000, and the specific structure of the battery pack 4000 is not described herein again.

[0177] It should be noted that, since the battery monomer 3000 or the battery pack 4000 is provided with the cover plate assembly 1000, the power consumption device 5000 of the embodiment of the present application can effectively improve the use safety of the power consumption device 5000 by using the battery monomer 3000 or the battery pack 4000.

[0178] It should be further noted that the power consumption device 5000 mentioned herein can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc.

[0179] Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc.; the spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.; the electric tool includes metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planes, etc.

[0180] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0181] The other configurations of the cover plate assembly 1000 of the battery monomer 3000, the battery monomer 3000, the battery pack 4000, and the power consumption device 5000 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0182] In the description of the present application, the description referring to the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description 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.

[0183] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cover plate assembly for a battery cell, wherein, The cover plate body (100) comprises: The pole assembly (200) is arranged on the cover plate body (100), and the pole assembly (200) is adapted to be electrically connected with a pole core; The explosion-proof valve (300) is arranged on the cover plate body (100); On the same projection plane, the outer contour of the front projection of the pole assembly (200) deviates from the center of the outer contour of the front projection of the cover plate body (100), and the side of the front projection of the pole assembly (200) close to the center of the outer contour of the front projection of the cover plate body (100) is a first side, and the front 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 plate body (100). On the projection plane, the minimum distance between the outer contour of the front projection of the explosion-proof valve (300) and the center of the outer contour of the front projection of the cover plate body (100) is a first interval, and the minimum distance between the outer contour of the front projection of the pole assembly (200) and the center of the outer contour of the front projection of the cover plate body (100) is a second interval, and the first interval is smaller than the second interval.

2. The cover plate assembly of claim 1, wherein, On the projection plane, the front projection of the explosion-proof valve (300) covers the center of the outer contour of the front projection of the cover plate body (100).

3. The cover plate assembly of battery cells according to claim 1 or 2, wherein, On the projection plane, the center of the front projection of the explosion-proof valve (300) is arranged apart from the center of the outer contour of the front projection of the cover plate body (100).

4. The battery cell cover plate assembly of any one of claims 1-3, wherein, On the projection plane, the minimum distance between the outer contour of the front projection of the explosion-proof valve (300) and the outer contour of the front projection of the cover plate body (100) is in the range of 3mm to 10mm.

5. The cover plate assembly of the battery cell according to any one of claims 1-4, wherein, On the projection plane, the distance between any two points on the outer contour of the front projection of the explosion-proof valve (300) is a radial distance, and the maximum radial distance of the explosion-proof valve (300) is in the range of 6mm to 30mm.

6. The cover plate assembly of the battery cell according to any one of claims 1-5, wherein, The explosion-proof valve (300) comprises an explosion-proof valve body (320) and a protective sheet (400), the cover plate body (100) comprises a first surface (130) and a second surface (140) arranged opposite along the thickness direction thereof, the cover plate body (100) is provided with a through hole (110) penetrating through the first surface (130) and the second surface (140), the explosion-proof valve body (320) covers the opening of the through hole (110) towards the first surface (130), and the protective sheet (400) covers the opening of the through hole (110) towards the second surface (140).

7. The cover plate assembly of the battery cell according to any one of claims 1-6, wherein, The explosion-proof valve body (320) is provided with a thinned area (310), and the thickness of the thinned area (310) is in the range of 0.15mm to 0.7mm.

8. The cover plate assembly of battery cells of claim 7, wherein, The protective sheet (400) is adhesively fixed to the second surface (140).

9. The cover plate assembly of battery cells according to claim 7 or 8, wherein, The thickness of the protective sheet (400) is in the range of 0.2mm to 0.7mm.

10. The cover plate assembly of the battery cell according to any one of claims 7-9, wherein, On the projection plane, the minimum distance between the outer contour of the front projection of the pole assembly (200) and the outer contour of the front projection of the explosion-proof valve (300) is in the range of 5mm to 15mm; and / or, 11. The cover plate assembly of the battery cell according to any one of claims 1-10, wherein, ​ The minimum distance between the outer contour of the normal projection of the pole post assembly (200) and the outer contour of the normal projection of the cover plate body (100) is in the range of 3mm-10mm.

12. The cover plate assembly of the battery cell according to any one of claims 1-11, wherein, The cover plate body (100) comprises a first surface (130) and a second surface (140) arranged oppositely along the thickness direction thereof, and a first communication hole (120) penetrating through the first surface (130) and the second surface (140) is arranged on the cover plate body (100), and the pole post assembly (200) is arranged in the first communication hole (120). The first pole post (210) is connected with the second surface (140); The second pole post (220) comprises a connecting cylinder (221) and a connecting plate (222), the connecting plate (222) is connected with the first surface (130), the connecting cylinder (221) penetrates through the first communication hole (120) to connect the first pole post (210) and the connecting plate (222), the connecting plate (222) is adapted to be electrically connected with the pole core, and the first pole post (210) is provided with an avoiding hole (211) opening towards the connecting cylinder (221), and the connecting cylinder (221) is connected with the first pole post (210) through the avoiding hole (211).

13. The cover plate assembly of battery cells of claim 12, wherein, The avoiding hole (211) comprises 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 communicated, the aperture of the first hole section is smaller than the aperture of the second hole section to define a step surface (212), the connecting cylinder (221) comprises a cylinder part (2211) and a limiting part (2212) connected with the cylinder part (2211), the limiting part (2212) is arranged on one side of the cylinder part (2211) in the axial direction, the limiting part (2212) is placed on the step surface (212) and is fixedly connected with the first pole post (210).

14. The cover plate assembly of battery cells according to claim 12 or 13, wherein, The connecting cylinder (221) and the connecting plate (222) are an integral part or separate parts.

15. The cover plate assembly of the battery cell according to any one of claims 12-14, wherein, The pole post assembly (200) further comprises a pole post cover plate (230) connected with the first pole post (210) to cover the avoiding hole (211).

16. The cover plate assembly of the battery cell according to any one of claims 1-15, wherein, An insulating sealing member (500) is arranged between the pole post assembly (200) and the cover plate body (100).

17. A battery cell, wherein, It comprises: A shell, an accommodating cavity with an opening formed in the shell; A pole core arranged in the accommodating cavity; A cover plate assembly according to any one of claims 1-16, the cover plate assembly is arranged at the opening.

18. The battery cell of claim 17, wherein, A current collecting disc (2000) is arranged in the accommodating cavity and between the cover plate assembly and the pole core, and the pole post assembly (200) is electrically connected with the pole core through the current collecting disc (2000).

19. The battery cell of claim 18, wherein, The current collecting plate (2000) is provided with a connecting protrusion (2010) protruding towards the pole column assembly (200), and the pole column assembly (200) is connected with the connecting protrusion (2010) in a matched mode.

20. The battery cell of any one of claims 17-19, wherein, The battery cell is formed as a cylindrical battery, and the middle part of the pole core has a center hole. At least part of the explosion-proof valve (300) is arranged opposite to the center hole in the thickness direction of the cover plate body (100).

21. The battery cell of any one of claims 17-19, wherein, The battery cell is formed as a cylindrical battery, and the middle part of the pole core has a center hole, and the explosion-proof valve (300) is arranged opposite to part of the center hole in the thickness direction of the cover plate body (100).

22. A battery pack, wherein, The battery pack comprises a plurality of battery cells according to any one of claims 17-21.

23. An electrical device, comprising: The battery pack comprises a battery cell according to any one of claims 17-21 or a battery pack according to claim 22.

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