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

Abstract

The utility model discloses a cover plate assembly of battery monomer, battery monomer, battery pack and power utilization device, the cover plate assembly of battery monomer comprises a cover plate body and a pole column assembly, the pole column assembly is arranged on the cover plate body and on the same projection plane, the orthographic projection of the pole column assembly deviates from the center of the outer contour of the orthographic projection of the cover plate body, the projection plane is perpendicular to the thickness direction of the cover plate body, the pole assembly comprises a first leading-out piece and a plurality of connecting pieces, the first leading-out piece is arranged on one side of the thickness direction of the cover plate body, and the connecting pieces penetrate through the cover plate body and are electrically connected with the first leading-out piece. According to the cover plate assembly of the battery monomer disclosed by the embodiment of the utility model, the structural stability of the pole assembly can be ensured while the cover plate body is ensured to have enough space for arranging other structural parts, the diversion area of the pole assembly is increased to a certain extent, high-rate overcurrent is realized, and the working performance of the battery monomer is improved.

Description

Technical Field

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

[0002] In the prior art, in order to facilitate the electrical connection between the pole core and the external structural member, a pole column assembly electrically connected to the pole core is usually provided on the cover plate assembly of the battery cell.

[0003] However, the existing pole assembly not only has a small flow conduction area, but also occupies most of the space on the cover assembly, affecting the conductive performance of the pole assembly. To a certain extent, it makes it impossible for the pole assembly to achieve high-rate current flow, and results in a small space for setting other structural parts (such as explosion-proof valves) on the cover assembly, which increases the difficulty of assembling the cover assembly and may even affect the safety of battery cells. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a cover plate assembly of a battery cell, which can ensure that the pole assembly can achieve a high-rate overcurrent while ensuring that there is enough space on the cover plate assembly to set other structural parts, so as to ensure the difficulty of assembling other structural parts and increase the size of other structural parts, thereby solving the technical problems in the prior art that the pole assembly cannot achieve a high-rate overcurrent and the pole assembly occupies most of the space on the cover plate assembly.

[0005] The second objective of the present invention is to provide a battery cell having the above-mentioned cover plate assembly.

[0006] The third objective of the present invention is to provide a battery pack having the above-mentioned battery cell.

[0007] A fourth objective of the present invention is to provide an electrical device having the above-mentioned battery pack.

[0008] According to the embodiment of the utility model, the cover plate assembly of the battery cell includes: a cover plate body; a pole assembly, wherein the pole assembly is arranged on the cover plate body, and on the same projection plane, the orthographic projection of the pole assembly deviates from the center of the outer contour of the orthographic projection of the cover plate body, wherein the projection plane is perpendicular to the thickness direction of the cover plate body; the pole assembly includes a first lead-out piece and a plurality of connecting pieces, wherein the first lead-out piece is arranged on one side of the thickness direction of the cover plate body, and each of the connecting pieces passes through the cover plate body and is electrically connected to the first lead-out piece.

[0009] According to the cover plate assembly of the battery cell of the embodiment of the utility model, on the projection plane perpendicular to the thickness direction of the cover plate body, the orthographic projection of the pole assembly is set to deviate from the center of the outer contour of the orthographic projection of the cover plate body, so that the pole assembly can make room for other structural parts arranged on the cover plate body, thereby ensuring that there is enough space on the cover plate body to arrange other structural parts, reducing the difficulty of assembling other structural parts with the cover plate body, and facilitating the increase of the size of other structural parts; at the same time, by setting the pole assembly to include multiple connectors, the multiple connectors cooperate to ensure that the first lead-out member can be stably arranged on one side of the thickness direction of the cover plate body, and the flow guide area of ​​the pole assembly can be increased to a certain extent, that is, the conductivity of the pole assembly is increased, a large rate of current is achieved, and the working performance of the battery cell is improved. That is to say, in the cover plate assembly of the battery cell of the present application, the pole assembly not only has a stable structure and good conductivity, but also makes room for other structural parts arranged on the cover plate body.

[0010] In some embodiments, the pole assembly further includes a second lead-out member, the second lead-out member and the first lead-out member are respectively arranged on both sides of the thickness direction of the cover plate body, and the connecting member is respectively fixedly electrically connected to the first lead-out member and the second lead-out member.

[0011] In some embodiments, along the thickness direction of the cover body, each of the connectors includes a first end close to the first lead-out piece and a second end close to the second lead-out piece, a plurality of the connectors penetrate into the first lead-out piece and the first end of each of the connectors does not exceed the end surface of the first lead-out piece on the side facing away from the cover body, and a plurality of the connectors penetrate into the second lead-out piece and the second end of each of the connectors does not exceed the end surface of the second lead-out piece on the side facing away from the cover body.

[0012] In some embodiments, the cover assembly of the battery cell also includes an explosion-proof valve, which is arranged on the cover body. The side of the orthographic outer contour of the pole assembly close to the center of the orthographic outer contour of the cover body is the first side, and the orthographic projection of the explosion-proof valve is arranged close to the first side.

[0013] In some embodiments, on the projection plane, the minimum distance between the orthographic outer contour of the explosion-proof valve and the center of the orthographic outer contour of the cover body is a first distance, and the minimum distance between the orthographic outer contour of the pole assembly and the center of the orthographic outer contour of the cover body is a second distance, and the first distance is smaller than the second distance.

[0014] In some embodiments, on the projection plane, the orthographic projection of the explosion-proof valve covers the center of the orthographic projection outer contour of the cover body.

[0015] In some embodiments, on the projection surface, a plurality of the connecting members are arranged at intervals.

[0016] In some embodiments, the cover plate assembly of the battery cell further includes an insulating seal, and the insulating seal is disposed between the pole assembly and the cover plate body.

[0017] The battery cell according to the embodiment of the utility model comprises: a shell, in which an open accommodating cavity is formed; a pole core, which is arranged in the accommodating cavity; a cover plate assembly, which is the aforementioned cover plate assembly, and the cover plate is arranged at the opening.

[0018] According to the battery cell of the embodiment of the utility model, the working performance of the battery cell can be guaranteed by adopting the aforementioned cover plate assembly.

[0019] In some embodiments, the first lead-out member is disposed on a side of the cover body facing away from the pole core.

[0020] In some embodiments, the battery cell further includes a current collecting plate, which is disposed in the accommodating cavity and between the cover plate assembly and the pole core, and the pole column assembly is electrically connected to the pole core through the current collecting plate.

[0021] In some embodiments, the cover plate assembly is the aforementioned cover plate assembly provided with a second lead-out piece, the second lead-out piece is provided on the side of the cover plate body facing the pole core, the second lead-out piece is provided with a first surface facing the collecting disk, the collecting disk is provided with a second surface facing the second lead-out piece, and the first surface and the second surface are electrically connected.

[0022] In some embodiments, the first surface and the second surface are electrically connected by welding or gluing.

[0023] In some embodiments, the current collecting plate includes a first connecting portion and a second connecting portion that are connected to each other, the second connecting portion can be folded in a direction toward or away from the first connecting portion, the second surface of the current collecting plate is located at the second connecting portion, the second connecting portion is electrically connected to the first surface of the second lead-out piece, and the first connecting portion is electrically connected to the pole core.

[0024] In some embodiments, the battery cell is formed as a cylindrical battery, the middle of the pole core has a central hole, and the cover body is provided with an explosion-proof valve; in the thickness direction of the cover body, at least part of the explosion-proof valve is arranged opposite to the central hole.

[0025] In some embodiments, the battery cell is formed as a cylindrical battery, the middle of the pole core has a center hole, and the cover body is provided with an explosion-proof valve; in the thickness direction of the cover body, the explosion-proof valve is arranged opposite to part of the center hole.

[0026] The battery pack according to the embodiment of the present invention includes a plurality of the aforementioned battery cells.

[0027] According to the battery pack of the embodiment of the utility model, the working performance of the battery pack can be guaranteed by adopting the aforementioned battery monomer.

[0028] The electric device according to the embodiment of the present invention includes the aforementioned battery cell or battery pack.

[0029] According to the electric device of the embodiment of the utility model, the working performance of the electric device can be guaranteed by adopting the aforementioned battery cell or battery pack.

[0030] Additional aspects and advantages of the present invention will become apparent from the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0032] Figure 1 It is a schematic diagram of the cover plate assembly and the current collecting plate in some embodiments of the present invention.

[0033] Figure 2 This is a top view of the cover plate assembly and the current collecting plate of some embodiments of the present invention when they are matched.

[0034] Figure 3 It is a cross-sectional view of the cover plate assembly and the current collecting plate of some embodiments of the present invention when they are matched.

[0035] Figure 4 for Figure 3 A partial enlarged view of area Ⅰ in the middle.

[0036] Figure 5 Exploded views of the cover plate assembly and the current collecting plate according to some embodiments of the present invention.

[0037] Figure 6 It is a schematic diagram of a partial structure of a pole assembly in some embodiments of the utility model.

[0038] Figure 7 It is a schematic diagram of another angle when the cover plate assembly and the current collecting plate of some embodiments of the utility model are matched, wherein the current collecting plate is in a folded state.

[0039] Reference numerals:

[0040] 1000, cover plate assembly;

[0041] 100, cover plate body;

[0042] 110, through hole; 120, first communicating hole;

[0043] 130, first side surface; 140, second side surface;

[0044] 200, pole assembly;

[0045] 210, first lead-out member;

[0046] 220, second lead-out member;

[0047] 230, connecting member; 231, first end; 232, second end;

[0048] 300, explosion-proof valve;

[0049] 320, explosion-proof valve body; 310, thinning area;

[0050] 400, protective film;

[0051] 500, insulation seal;

[0052] 510, insulating member; 520, sealing member;

[0053] 2000, collector plate;

[0054] 2030, first connection part; 2040, second connection part. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] The cap plate assembly 1000 of a battery cell according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0058] like Figure 1 , Figure 2 and Figure 3 As shown, the cap plate assembly 1000 of the battery cell according to the embodiment of the present invention includes: a cap plate body 100 and a pole assembly 200 .

[0059] Among them, combined Figure 2 , Figure 3 and Figure 4 As shown, the pole assembly 200 is arranged on the cover body 100. On the same projection plane, the orthographic projection of the pole assembly 200 deviates from the center of the outer contour of the orthographic projection of the cover body 100, wherein the projection plane is perpendicular to the thickness direction of the cover body 100. The thickness direction mentioned here can be understood as Figure 3 In the Z direction shown in , the orthographic projection of the pole assembly 200 and the cover assembly 1000 in the direction perpendicular to the thickness of the cover body 100 can also be understood as the orthographic projection of the pole assembly 200 and the cover assembly 1000 on a plane parallel to the cover body 100. Figure 2 The cover body 100 shown in FIG. 1 is the plane of the cover body 100 .

[0060] That is, the orthographic projection of the pole assembly 200 on the plane parallel to the cover body 100 is arranged away from the center of the orthographic projection outer contour of the cover body 100 on the plane parallel to the cover body 100 .

[0061] It should be noted that the deviation of the orthographic projection of the pole assembly 200 from the center of the orthographic projection outer contour of the cover body 100 can be understood as the center of the orthographic projection outer contour of the pole assembly 200 and the center of the orthographic projection outer contour of the cover body 100 are spaced apart on the projection plane.

[0062] In addition, when the shape of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100 is formed into a circular shape, the center is the center of the circle of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100; when the shape of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100 is formed into a square shape, the center is the intersection of the diagonals of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100; when the shape of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100 is formed into a triangular shape, the center is the intersection of the three medians of the orthographic projection of the pole assembly 200 and the orthographic projection outer contour of the cover body 100.

[0063] The above can also be understood as follows: in the radial direction of the cover body 100, the pole assembly 200 is arranged away from the radial center of the cover body 100, wherein the radial direction of the cover body 100 is perpendicular to the axial direction of the cover body 100, and the axial direction of the cover body 100 can be understood as Figure 3 The Z direction shown in .

[0064] Through the above arrangement, the pole assembly 200 can give up the radial center area of ​​the cover body 100, so that the cover body 100 has enough space on the radial side of the pole assembly 200 to set other structural parts (such as the explosion-proof valve 300 described below), so as to reduce the difficulty of assembling other structural parts and the cover body 100, and it is beneficial to increase the size of other structural parts to ensure the performance of other structural parts, thereby ensuring the working performance of the battery cell.

[0065] Combination Figure 2 , Figure 3 and Figure 4 As shown, the pole assembly 200 includes a first lead-out member 210 and a plurality of connectors 230. The first lead-out member 210 is provided on one side of the thickness direction of the cover body 100. Each connector 230 is penetrated through the cover body 100 and is electrically connected to the first lead-out member 210. By providing a plurality of connectors 230, the cooperation of the plurality of connectors 230 can improve the position stability of the pole assembly 200 on the one hand, and can also increase the flow conduction area of ​​the pole assembly 200 on the other hand, that is, to a certain extent, ensure the conductive performance of the pole assembly 200, realize the high-rate overcurrent of the pole assembly 200, and help improve the working performance of the battery cell.

[0066] It should be noted that the thickness direction of the cover body 100 mentioned above can be understood as Figure 3 The Z direction shown in FIG. 1 is the axial direction of the cover plate body 100 .

[0067] In some embodiments, in the thickness direction of the cover body 100, the first lead-out member 210 may be disposed at the cover body 100 toward the current collecting plate 2000 (the specific structure of the current collecting plate 2000 can be seen in FIG. Figure 3 and Figure 5 ) side, and can also be arranged on the side of the cover body 100 away from the collecting plate 2000.

[0068] In a specific example, combined with Figure 1 , Figure 3 and Figure 4 As shown, the first lead-out member 210 is disposed on the side of the cover body 100 away from the current collecting plate 2000, so as to realize the electrical connection between the pole assembly 200 and the external structural member. It can also be understood here that the first lead-out member 210 is disposed on the side of the cover body 100 away from the pole core.

[0069] The external structural member mentioned here can be understood as a bus, and the specific structure of the bus will not be described in detail in this application.

[0070] It should also be noted that, in the description of the present invention, unless otherwise specified, “plurality” means two or more, that is, the pole assembly 200 includes at least two connectors 230 .

[0071] In some embodiments, the pole assembly 200 is suitable for being electrically connected to the collecting plate 2000, and the collecting plate 2000 is electrically connected to the pole core, thereby realizing the electrical connection between the pole assembly 200 and the pole core, so as to utilize the pole assembly 200 to lead out the current of the pole core and ensure the working performance of the pole core.

[0072] It should also be noted that, in the thickness direction of the cover body 100, when the first lead-out piece 210 is arranged on the side of the cover body 100 facing the collecting plate 2000, the first lead-out piece 210 and / or the connecting piece 230 can be electrically connected to the collecting plate 2000, thereby realizing the electrical connection between the pole assembly 200 and the collecting plate 2000, thereby ensuring the connection area and connection quality between the pole assembly 200 and the collecting plate 2000; when the first lead-out piece 210 is arranged on the side of the cover body 100 away from the collecting plate 2000, only the connecting piece 230 can be electrically connected to the collecting plate 2000, thereby also realizing the electrical connection between the pole assembly 200 and the collecting plate 2000.

[0073] In addition, by arranging the pole assembly 200 on the cover body 100 , the cover body 100 can be used to support the pole assembly 200 , thereby further improving the position stability of the pole assembly 200 , thereby ensuring the working performance of the pole assembly 200 .

[0074] It can be seen from the above structure that the cover plate assembly 1000 of the battery cell in the embodiment of the utility model can ensure the structural stability of the pole assembly 200 while ensuring that there is sufficient space on the cover plate body 100 to set other structural parts, and to a certain extent ensure the flow conduction area of ​​the pole assembly 200 to achieve a large current rate.

[0075] It can be understood that compared with the prior art, the present application creatively adjusts the setting position of the pole assembly 200 on the cover body 100 and adjusts the structure of the pole assembly 200. While ensuring that there is sufficient space on the cover body 100 to set other structural parts, it can also ensure the conductivity of the pole assembly 200, so as to improve the working performance of the battery cell.

[0076] In the description of the present utility model, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe the features, without any distinction in order or importance.

[0077] In some embodiments, in combination Figure 2 , Figure 3 and Figure 4 As shown, the pole assembly 200 further includes a second lead-out member 220, the first lead-out member 210 and the second lead-out member 220 are respectively arranged on both sides of the thickness direction of the cover plate body 100, and the connecting member 230 is respectively fixed and electrically connected to the first lead-out member 210 and the second lead-out member 220. Thus, the fixed electrical connection between the first lead-out member 210 and the second lead-out member 220 is achieved, so as to reduce the connection difficulty of the first lead-out member 210 and the second lead-out member 220.

[0078] At the same time, by setting up multiple connecting members 230, the cooperation of multiple connecting members 230 can improve the connection strength between the first lead member 210 and the second lead member 220, so that the relative position of the first lead member 210 and the second lead member 220 is stable, thereby improving the position stability of the pole assembly 200.

[0079] In some embodiments, in combination Figure 3 and Figure 4 As shown, the second lead-out piece 220 is arranged on the side of the cover body 100 facing the collecting plate 2000, that is, the second lead-out piece 220 is arranged on the side of the cover body 100 facing the pole core, so that the second lead-out piece 220 is arranged close to the collecting plate 2000, which facilitates the use of the second lead-out piece 220 to realize the electrical connection between the pole assembly 200 and the collecting plate 2000, thereby reducing the difficulty of electrical connection between the pole assembly 200 and the collecting plate 2000.

[0080] In some embodiments, the connector 230 is interference fit with the second lead-out member 220 of the pole assembly 200. This can ensure the connection strength between the connector 230 and the second lead-out member 220 while reducing the difficulty of connecting the connector 230 and the second lead-out member 220, thereby achieving a fixed connection between the connector 230 and the second lead-out member 220.

[0081] Of course, in some other embodiments, the connecting member 230 and the second lead-out member 220 may also be connected by welding; or, the connecting member 230 and the second lead-out member 220 are formed as an integral part to ensure the connection strength between the connecting member 230 and the second lead-out member 220 .

[0082] in, Figure 6 A schematic diagram showing the connection between the connecting member 230 and the second lead-out member 220 is shown.

[0083] Optionally, the connecting member 230 is riveted and fixed to the first lead-out member 210 of the pole assembly 200 to ensure the connection strength between the connecting member 230 and the first lead-out member 210 and reduce the difficulty of connecting the connecting member 230 and the first lead-out member 210 .

[0084] At the same time, by riveting the connecting member 230 and the first lead-out member 210 together, it is also convenient to utilize the first lead-out member 210 and the second lead-out member 220 to cooperate and compress the insulating seal 500 below to ensure the sealing effect of the insulating seal 500.

[0085] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, a first connecting hole 120 is provided on the cover body 100, and a first lead-out piece 210 and a second lead-out piece 220 are respectively provided on opposite sides of the first connecting hole 120, and a connecting piece 230 is passed through the first connecting hole 120 and is respectively fixedly electrically connected with the first lead-out piece 210 and the second lead-out piece 220. In this way, while ensuring the electrical connection between the first lead-out piece 210 and the second lead-out piece 220, the pole assembly 200 can also be provided on the cover body 100, so as to improve the position stability of the pole assembly 200 and reduce the difficulty of matching the pole assembly 200 with the cover body 100.

[0086] In a specific example, during the assembly process of the pole assembly 200 and the cover body 100, the connector 230 and the second lead-out member 220 may be assembled and connected first, and then the connector 230 and the second lead-out member 220 may be assembled and connected. Figure 6 As shown), the connecting piece 230 is passed through the cover body 100 and connected to the first lead-out piece 210, thereby realizing the assembly connection of the pole assembly 200, and connecting the pole assembly 200 to the cover body 100, reducing the difficulty of assembling the pole assembly 200 and the cover body 100.

[0087] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, on the projection plane, the orthographic outer contour of the pole assembly 200 is spaced from the orthographic outer contour of the cover body 100. Since the pole assembly 200 is arranged on the cover body 100 through the first connecting hole 120, by spacing the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100, the first connecting hole 120 can be spaced from the outer edge of the cover body 100, thereby avoiding damage to the cover body 100 in the process of opening the first connecting hole 120 to a certain extent, extending the service life of the cover body 100, and at the same time improving the structural strength of the cover body 100.

[0088] Optionally, on the projection plane, the minimum spacing between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100 is in the range of 3mm to 10mm. This means that on a plane parallel to the cover body 100, there are multiple distances between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100, and the value range of the closest distance is 3mm to 10mm. It can also be understood that on a plane parallel to the cover body 100, the minimum spacing between the orthographic outer contour of the first connecting hole 120 and the orthographic outer contour of the cover body 100 is in the range of 3mm to 10mm.

[0089] Therefore, the minimum distance between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the cover body 100 on the projection plane mentioned above can be understood as Figure 1 L4 shown in .

[0090] Among them, when L4 is designed to be of appropriate size, the distance between the first connecting hole 120 and the outer edge of the cover body 100 will be appropriate, thereby improving the structural strength of the cover body 100; at the same time, the pole assembly 200 will occupy an appropriate space on the cover body 100, thereby allowing sufficient space on the cover body 100 to arrange the explosion-proof valve 300 and other structural parts, which is conducive to setting a large-sized explosion-proof valve 300 and improving the safety of battery cells.

[0091] Therefore, the present application sets the value range of the minimum spacing L4 between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100 on the projection plane to 3mm to 10mm. In this way, while ensuring the structural strength of the cover body 100, it can also ensure that the pole assembly 200 occupies a suitable space on the cover body 100, so that there is enough space on the cover body 100 to arrange other structural parts, which is conducive to ensuring the size of other structural parts and improving the working performance of other structural parts.

[0092] In a specific example, on the projection plane, the minimum distance between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover body 100 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc.

[0093] It should also be noted that the outer shape of the pole assembly 200 can be any closed geometric shape such as annular, rectangular, sector-shaped, arc-shaped or circular, and this application does not impose any specific limitation.

[0094] In some embodiments, in combination Figure 3 and Figure 4 As shown, along the thickness direction of the cover body 100, each connector 230 includes a first end 231 and a second end 232, the first end 231 is close to the first lead-out piece 210, and the second end 232 is close to the second lead-out piece 220, multiple connectors 230 penetrate into the first lead-out piece 210 and the first end 231 of each connector 230 does not exceed the end surface of the first lead-out piece 210 facing away from the cover body 100, multiple connectors 230 penetrate into the second lead-out piece 220 and the second end 232 of each connector 230 does not exceed the end surface of the second lead-out piece 220 facing away from the cover body 100. What is meant here is that when the connector 230 is passed through the cover body 100 and is fixedly electrically connected to the first lead-out piece 210 and the second lead-out piece 220 respectively, the first end 231 of the connector 230 close to the first lead-out piece 210 does not exceed the end surface of the first lead-out piece 210 that is away from the cover body 100, and the second end 232 of the connector 230 close to the second lead-out piece 220 does not exceed the end surface of the second lead-out piece 220 that is away from the cover body 100. In this way, when the first lead-out piece 210 is connected to an external structural member, the outer surface of the first lead-out piece 210 can be conveniently used to connect to the external structural member, so that the first lead-out piece 210 forms a surface connection with the external structural member, thereby increasing the connection area and ensuring the connection strength and stability.

[0095] Correspondingly, by setting the second end 232 to not exceed the end surface of the second lead-out piece 220 facing away from the cover body 100, when the second lead-out piece 220 is connected to an external structural member (such as the collecting plate 2000 described below), the outer surface of the second lead-out piece 220 can be conveniently connected to the collecting plate 2000, so that the first lead-out piece 210 and the collecting plate 2000 form a surface connection, thereby increasing the connection area between the first lead-out piece 210 and the collecting plate 2000, ensuring the connection strength and stability, and ensuring the current flow capacity of the collecting plate 2000.

[0096] In some embodiments, Figure 4As shown, the end face of the second end 232 of the connecting member 230 is flush with the end face of the second lead-out member 220 on the side facing away from the cover body 100, so that when the second lead-out member 220 is connected to the collecting plate 2000, the outer surface of the second lead-out member 220 and the end face of the connecting member 230 can be connected to the collecting plate 2000, so as to further increase the connection area between the pole assembly 200 and the collecting plate 2000.

[0097] In some other embodiments, the end surface of the first end 231 of the connecting member 230 may also be flush with the outer surface of the end surface of the first lead-out member 210 facing away from the cover body 100, which is not specifically limited here.

[0098] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, the cover plate assembly 1000 of the battery cell further includes an explosion-proof valve 300, which is disposed on the cover plate body 100, and the side of the orthographic projection outer contour of the pole assembly 200 close to the center of the orthographic projection outer contour of the cover plate body 100 is the first side, and the orthographic projection of the explosion-proof valve 300 is disposed close to the first side. In other words, the explosion-proof valve 300 is not only disposed on the cover plate body 100, but also the projection of the explosion-proof valve 300 on a plane parallel to the cover plate body 100 is located on the side of the orthographic projection of the pole assembly 200 close to the center of the orthographic projection outer contour of the cover plate body 100.

[0099] Among them, by arranging the explosion-proof valve 300 on the cover plate body 100, it can be ensured that when the internal pressure of the battery cell is relatively large, the pressure can be discharged smoothly, so as to ensure the safety of the battery cell.

[0100] The above can also be understood as, in the radial direction of the cover body 100, the pole assembly 200 is set away from the radial center of the cover body 100, the explosion-proof valve 300 and the pole assembly 200 are arranged in sequence in the radial direction of the cover body 100, and the explosion-proof valve 300 is located on the side of the pole assembly 200 close to the radial center of the cover body 100.

[0101] Through the above arrangement, while it is convenient to use the cover body 100 to support the explosion-proof valve 300 and improve the position stability of the explosion-proof valve 300, it is also possible to set the explosion-proof valve 300 at a position with a larger spare space on the cover body 100, thereby reducing the difficulty of assembling the explosion-proof valve 300 and the cover body 100, and facilitating the arrangement of a large-sized explosion-proof valve 300 on the cover body 100, so as to improve the pressure relief capacity of the explosion-proof valve 300 and ensure the smoothness of exhaust to a certain extent, thereby improving the safety of the battery cell.

[0102] That is to say, the present application arranges the pole assembly 200 in a radial direction of the cover body 100 away from the center of the cover body 100. While ensuring that the pole assembly 200 and the explosion-proof valve 300 can be both arranged on the cover body 100, the installation space of the explosion-proof valve 300 can also be guaranteed, so as to enhance the pressure relief capacity of the explosion-proof valve 300, thereby ensuring the working performance of the battery cell to a certain extent.

[0103] In summary, the present application provides a cover plate assembly 1000 that is different from the current state of the art in the industry. The main technical solution is to configure the pole assembly 200 to include a first lead-out piece 210, a second lead-out piece 220 and a plurality of connectors 230, and to design the pole assembly 200 to be offset relative to the radial center of the cover plate body 100, thereby freeing up the radial center area of ​​the cover plate body 100, which is conducive to designing a large-sized explosion-proof valve 300 on the cover plate body 100, replacing the existing sodium electric material system or large-capacity battery with a two-way double explosion-proof valve structure, simplifying the structure of the cover plate body 100, achieving directional and effective explosion-proof, and improving the safety performance of the battery cell.

[0104] It should be noted that Figure 5 The explosion-proof valve 300 is shown to be circular in shape. In other embodiments, the explosion-proof valve 300 may be designed to be any geometric shape such as a rectangle, triangle, trapezoid, ring or sector according to actual process or performance requirements, and this application does not impose any specific limitation.

[0105] In some embodiments, in combination Figure 1 , Figure 3 and Figure 5 As shown, the explosion-proof valve 300 includes an explosion-proof valve body 320 and a protective sheet 400, and the cover body 100 includes a first side surface 130 and a second side surface 140, the first side surface 130 and the second side surface 140 are arranged opposite to each other along the thickness direction of the cover body 100, and the cover body 100 is provided with a through hole 110 penetrating the first side surface 130 and the second side surface 140, the explosion-proof valve body 320 covers the opening of the through hole 110 toward the first side surface 130, and the protective sheet 400 covers the opening of the through hole 110 toward the second side surface 140. The thickness direction of the cover body 100 mentioned here can be understood as Figure 3 The Z direction shown in FIG. 1 is the axial direction of the cover plate body 100 .

[0106] That is to say, the cover body 100 includes a first side surface 130 and a second side surface 140 which are arranged opposite to each other in the axial direction of the cover body 100. The cover body 100 is also provided with a through hole 110 which penetrates the first side surface 130 and the second side surface 140, so that the through hole 110 penetrates the cover body 100 in the axial direction of the cover body 100. After the through hole 110 is formed, the through hole 110 has an opening facing the first side surface 130 and an opening facing the second side surface 140. By covering the opening of the through hole 110 facing the first side surface 130 with the explosion-proof valve body 320 and covering the opening of the through hole 110 facing the second side surface 140 with the protective sheet 400, it is possible to cover the through hole 110 with the explosion-proof valve 300. Not only can the explosion-proof valve 300 be used to improve the safety of the battery cell, but also external foreign matter can be prevented from entering the battery cell through the through hole 110, thereby ensuring the working performance of the battery cell to a certain extent.

[0107] In some embodiments, in combination Figure 3 and Figure 5 As shown, the explosion-proof valve body 320 is arranged at the opening of the through hole 110 toward the first side surface 130, so that the explosion-proof valve body 320 can be arranged on the cover body 100, thereby facilitating the use of the cover body 100 to support the explosion-proof valve body 320, improving the position stability of the explosion-proof valve body 320, and reducing the difficulty of matching the explosion-proof valve body 320 with the cover body 100.

[0108] Optionally, the explosion-proof valve body 320 is connected to the through hole 110 by laser welding and fusion. This can reduce the difficulty of matching the explosion-proof valve body 320 with the cover body 100 while ensuring the connection strength between the explosion-proof valve body 320 and the cover body 100, improve the position stability of the explosion-proof valve body 320, and thus ensure the working performance of the explosion-proof valve body 320.

[0109] It should be noted that after the explosion-proof valve body 320 is laser welded, it is necessary to ensure that there are no cold welds or weld holes and that it has the airtightness required by the design.

[0110] In some embodiments, in combination Figure 2 and Figure 5 As shown, the explosion-proof valve body 320 is provided with a thinning area 310, and the thickness of the thinning area 310 is 0.15mm to 0.7mm. This ensures that when the internal pressure of the battery cell is high, the explosion-proof valve body 320 can be effectively ruptured, so that the gas in the battery cell can be discharged through the explosion-proof valve body 320 to achieve the effect of pressure relief and explosion prevention, and ensure the working performance of the explosion-proof valve body 320.

[0111] In some embodiments, a thinning notch structure may be provided on the explosion-proof valve body 320 to form a thinning area 310 on the explosion-proof valve body 320 , thereby ensuring the working performance of the explosion-proof valve 300 .

[0112] The thinning area 310 may be in any geometric shape such as a circle, annular or geometric cross.

[0113] It should be noted that the thickness of the thinned area 310 mentioned above can be understood as the thickness of part of the structure on the explosion-proof valve body 320 after being compressed and thinned. When the thickness of the thinned area 310 is thin, the structural strength of the explosion-proof valve 300 will be reduced, shortening the service life of the explosion-proof valve 300; when the thickness of the thinned area 310 is thick, when the internal pressure of the battery cell is high, it cannot be guaranteed that the explosion-proof valve 300 can be effectively ruptured, reducing the safety of the battery cell.

[0114] Therefore, the present application sets the thickness of the thinned area 310 to 0.15mm~0.7mm. In this way, while the structural strength of the explosion-proof valve body 320 is maintained, it can also ensure that when the internal pressure of the battery cell is high, the explosion-proof valve body 320 can be effectively ruptured, thereby facilitating the discharge of gas in the battery cell through the explosion-proof valve 300, so as to achieve the effect of pressure relief and explosion prevention, thereby improving the safety of the battery cell.

[0115] In a specific example, the thickness of the thinned area 310 is 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0116] Of course, in some other embodiments, the thickness of the thinned area 310 may also be determined according to the explosion-proof pressure designed for each type of battery cell.

[0117] In some embodiments, in combination Figure 3 and Figure 5 As shown, the protection sheet 400 is arranged at the opening of the through hole 110 toward the second side surface 140, so that the protection sheet 400 is arranged on the cover body 100, and the explosion-proof valve body 320 and the protection sheet 400 are arranged at opposite ends of the through hole 110, so that the protection sheet 400 is used to protect the explosion-proof valve body 320, and external foreign matter is prevented from falling into the explosion-proof valve body 320 and causing damage to the explosion-proof valve body 320, thereby ensuring the working performance of the explosion-proof valve body 320, ensuring that the explosion-proof valve body 320 can effectively realize the rapid exhaust and pressure relief of the battery monomer, so as to play an explosion-proof role, and to a certain extent solve the technical problem of battery monomer self-explosion.

[0118] Optionally, the protective sheet 400 is made of rubber to ensure that the protective sheet 400 can be dissolved when heated, so as to ensure that when the explosion-proof valve body 320 is exhausted due to thermal runaway, the protective sheet 400 can be dissolved to facilitate the discharge of gas through the through hole 110, thereby ensuring the safety of the battery cell.

[0119] In some embodiments, the protective sheet 400 is bonded and fixed to the second side surface 140. In this way, the protective sheet 400 is fixedly connected to the cover body 100, and the connection between the protective sheet 400 and the cover body 100 can be dissolved by heat during thermal runaway exhaust, which facilitates gas exhaust and further ensures the safety of the battery cell.

[0120] In some embodiments, the thickness of the protective sheet 400 ranges from 0.2 mm to 0.7 mm. Figure 3 As shown in T, when the thickness of the protective sheet 400 is designed to be within the above range, the working performance of the protective sheet 400 will be further improved, so that the protective sheet 400 can effectively protect the explosion-proof valve body 320, which is conducive to the dissolution of the protective sheet 400 when heated, thereby improving the exhaust effect.

[0121] Therefore, the present application sets the thickness range of the protection sheet 400 to 0.2 mm to 0.7 mm, so that while ensuring the working performance of the protection sheet 400 and ensuring that the protection sheet 400 can effectively protect the explosion-proof valve body 320, the protection sheet 400 can also be dissolved when heated to facilitate gas discharge.

[0122] In a specific example, the thickness of the protection sheet 400 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.7 mm.

[0123] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, on the projection plane, the orthographic outer contour of the pole assembly 200 is spaced from the orthographic outer contour of the explosion-proof valve 300. This is to avoid the pole assembly 200 and the explosion-proof valve 300 from influencing each other during the assembly process, thereby avoiding damage to the pole assembly 200 and the explosion-proof valve 300 during the assembly process, and ensuring the working performance of the pole assembly 200 and the explosion-proof valve 300.

[0124] In summary, on the projection plane, the orthographic outer contour of the pole assembly 200 of the present application is spaced apart from the orthographic outer periphery of the explosion-proof valve 300 and the orthographic outer contour of the cover body 100, respectively. In this way, while ensuring the structural strength of the cover body 100, the working performance of the pole assembly 200 and the explosion-proof valve 300 can also be guaranteed.

[0125] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3As shown, on the projection surface, the orthographic outer contour of the explosion-proof valve 300 is spaced from the orthographic outer contour of the cover body 100. It should be noted that, since the explosion-proof valve 300 is disposed on the cover body 100 through the through hole 110, by spacing the orthographic outer contour of the explosion-proof valve 300 from the orthographic outer contour of the cover body 100, the through hole 110 can be spaced from the outer edge of the cover body 100, thereby avoiding damage to the cover body 100 during the process of opening the through hole 110 to a certain extent, extending the service life of the cover body 100, and at the same time improving the structural strength of the cover body 100.

[0126] In some embodiments, on the projection plane, the minimum distance between the orthographic projection outer contour of the explosion-proof valve 300 and the orthographic projection outer contour of the cover body 100 is in the range of 3mm to 10mm. It can also be understood here that on a plane parallel to the cover body 100, there are multiple distances between the orthographic projection outer contour of the explosion-proof valve 300 and the orthographic projection outer contour of the cover body 100, and the value range of the closest distance is 3mm to 10mm. It can also be understood that on a plane parallel to the cover body 100, the minimum distance between the orthographic projection outer contour of the through hole 110 and the orthographic projection outer contour of the cover body 100 is in the range of 3mm to 10mm.

[0127] Therefore, the minimum distance between the orthographic projection outer contour of the explosion-proof valve 300 and the orthographic projection outer contour of the cover body 100 on the projection surface mentioned above can be understood as Figure 1 As shown in the figure, when L1 is kept in a suitable range, the structural strength of the cover body 100 is ensured, and the explosion-proof valve 300 occupies a suitable space on the cover body 100, so that there is enough space on the cover body 100 to arrange the pole assembly 200, thereby ensuring the size and installation of the pole assembly 200.

[0128] Therefore, the present application sets the value range of the minimum spacing L1 between the orthographic outer contour of the explosion-proof valve 300 and the orthographic outer contour of the cover body 100 on the projection plane to 3mm to 10mm. In this way, while ensuring the structural strength of the cover body 100, it can also ensure that the explosion-proof valve 300 occupies a suitable space on the cover body 100, so that there is enough space on the cover body 100 to arrange the pole assembly 200, which is conducive to ensuring the size of the pole assembly 200, improving the working performance of the pole assembly 200, and reducing the installation difficulty of the pole assembly 200.

[0129] In a specific example, on the projection plane, the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the orthographic outer contour of the cover body 100 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc.

[0130] In some embodiments, on the projection plane, the minimum spacing between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300 is in the range of 5mm to 15mm. Here, it means that on a plane parallel to the cover body 100, there are multiple distances between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300, and the value range of the closest distance is 5mm to 15mm. It can also be understood that on a plane parallel to the cover body 100, the minimum spacing between the orthographic projection outer contour of the first connecting hole 120 and the orthographic projection outer contour of the through hole 110 is in the range of 5mm to 15mm.

[0131] Therefore, the minimum distance between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300 on the projection plane mentioned above can be understood as Figure 1 As shown in the figure, when L3 is designed to be of a suitable size, it is convenient to assemble the pole assembly 200 and the explosion-proof valve 300, further improve the working performance of the pole assembly 200 and the explosion-proof valve 300, and is conducive to setting a large-sized explosion-proof valve 300. On the other hand, it is also convenient to set a suitable distance between the pole assembly 200 and the outer edge of the cover body 100 to ensure the structural strength of the cover body 100. Therefore, the present application sets the value range of the minimum distance L3 between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300 on the projection plane to 5mm to 15mm, so that while ensuring the structural strength of the cover body 100, the pole assembly 200 and the explosion-proof valve 300 can be avoided from affecting each other during the assembly process, thereby ensuring the working performance of the explosion-proof valve 300 and the pole assembly 200, and at the same time, it is convenient to set a large-sized explosion-proof valve 300, thereby improving the safety of battery cells.

[0132] In a specific example, on the projection plane, the minimum distance between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the explosion-proof valve 300 is 5 mm, 8 mm, 10 mm, 12 mm or 15 mm, etc.

[0133] In some embodiments, on the projection plane, the minimum spacing between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100 is a first spacing, and the minimum spacing between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100 is a second spacing, and the first spacing is smaller than the second spacing. That is to say, on the projection plane, there are multiple distances between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100, and there are multiple distances between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100, wherein the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100 is smaller than the minimum distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100, so that relative to the pole assembly 200, in the radial direction of the cover body 100, the explosion-proof valve 300 can be arranged closer to the radial center of the cover body 100, thereby facilitating the arrangement of a large-sized explosion-proof valve 300 on the cover body 100, so as to improve the pressure relief capacity of the explosion-proof valve 300, thereby improving the safety of battery cells.

[0134] It should be noted that the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100 means that on the projection plane, there are multiple distances between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100. The shortest distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100 is defined as the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover body 100.

[0135] Correspondingly, the minimum distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100 means that, on the projection plane, there are multiple distances between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100, and the closest distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100 is defined as the minimum distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover body 100.

[0136] In some embodiments, Figure 2As shown, on the projection plane, the orthographic projection of the explosion-proof valve 300 covers the center of the orthographic projection outer contour of the cover body 100. It can also be understood here that on the projection plane, the center of the orthographic projection outer contour of the cover body 100 is located within the orthographic projection of the explosion-proof valve 300, so that the explosion-proof valve 300 can be arranged closer to the center of the cover body 100 in the radial direction of the cover body 100, which is conducive to using the space on the cover body 100 to arrange a large-sized explosion-proof valve 300, thereby improving the pressure relief capacity of the explosion-proof valve 300.

[0137] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, on the projection plane, the center of the orthographic projection of the explosion-proof valve 300 is spaced from the center of the orthographic projection outer contour of the cover body 100. This can avoid that the radial center of the explosion-proof valve 300 is arranged opposite to the radial center of the cover body 100 in the axial direction of the cover body 100, so that the explosion-proof valve 300 can be offset relative to the radial center of the cover body 100, providing space for the arrangement of the pole assembly 200, so that the pole assembly 200 can be effectively arranged on the cover body 100, reducing the difficulty of fixing the pole assembly 200, and ensuring the size of the pole assembly 200.

[0138] That is to say, in the radial direction of the cover body 100, the explosion-proof valve 300 and the pole assembly 200 on the cover assembly 1000 of the present application are both set away from the radial center of the cover body 100 to achieve rational utilization of the space on the cover body 100. In this way, while ensuring that the explosion-proof valve 300 and the pole assembly 200 can both be arranged on the cover body 100, it is also possible to set a large-sized explosion-proof valve 300 to improve the pressure relief capacity of the explosion-proof valve 300, thereby improving the safety of battery cell use.

[0139] In some embodiments, on the projection surface, the distance between any two points on the outer contour of the orthographic projection of the explosion-proof valve 300 is the radial distance, and the maximum radial distance of the explosion-proof valve 300 has a value range of 6 mm to 30 mm. Here, it means that on the projection surface, when the orthographic projection of the explosion-proof valve 300 has multiple radial distances, the maximum radial distance has a value range of 6 mm to 30 mm, so that the outer dimensions of the explosion-proof valve 300 range from 6 mm to 30 mm.

[0140] Among them, when the maximum radial distance of the explosion-proof valve 300 is designed to be within the above range, on the one hand, the area of ​​the explosion-proof valve 300 will be appropriate, the exhaust performance of the explosion-proof valve 300 will be improved, and the safety of the battery cell will be improved; at the same time, the area occupied by the explosion-proof valve 300 is appropriate, and there is enough space on the cover body 100 to arrange the pole assembly 200, ensuring the size and installation of the pole assembly 200.

[0141] Therefore, the present application sets the maximum radial distance range of the explosion-proof valve 300 to 6 mm to 30 mm. In this way, while ensuring that the gas production during instantaneous vaporization of the electrolyte can be smoothly discharged through the explosion-proof valve 300, it can also ensure that the explosion-proof valve 300 occupies a suitable space on the cover body 100, which is conducive to ensuring the size of the pole assembly 200, improving the working performance of the pole assembly 200, and reducing the difficulty of installing the pole assembly 200.

[0142] In a specific example, the maximum radial distance of the explosion-proof valve 300 is 6 mm, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm.

[0143] It should be noted that the maximum radial distance of the explosion-proof valve 300 can be understood as Figure 1 L2 shown in .

[0144] 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 .

[0145] Of course, in some other embodiments, the maximum radial distance of the explosion-proof valve 300 can also be adjusted according to the material system of the battery cell, the diameter of the pole core, the capacity of the battery cell or the electrolyte weight of the battery cell, and is not limited to being set to the above-mentioned 6mm to 30mm.

[0146] In some embodiments, on the projection plane, the orthographic projection area of ​​the explosion-proof valve 300 is S1, and the orthographic projection area of ​​the cover plate assembly 1000 is S, wherein S1=0.2S~0.8S, and the units of S and S1 are the same. Specifically, it can be S1=0.2S, S1=0.3S, S1=0.4S, S1=0.5S, S1=0.6S, S1=0.7S, S1=0.8S. In other words, the orthographic projection area of ​​the explosion-proof valve 300 on the plane parallel to the cover plate body 100 is 20%~80% of the orthographic projection area of ​​the cover plate assembly 1000 on the plane parallel to the cover plate body 100. On the one hand, the exhaust performance of the explosion-proof valve 300 can be improved, thereby increasing the safety of the battery cell to a certain extent. On the other hand, it ensures that the explosion-proof valve 300 occupies a suitable area on the cover plate body 100, which is convenient for designing the size and installation of the pole assembly 200.

[0147] Therefore, the present application sets the orthographic projection area of ​​the explosion-proof valve 300 on the projection surface to 20% to 80% of the orthographic projection area of ​​the cover assembly 1000 on the projection surface. While ensuring that the gas produced during instantaneous vaporization of the electrolyte can be smoothly discharged through the explosion-proof valve 300, it can also avoid the explosion-proof valve 300 occupying a suitable space on the cover body 100, which is beneficial to ensuring the size of the pole assembly 200.

[0148] It should be noted that the same units of S and S1 mean that, when the unit of the orthographic projection area S1 of the explosion-proof valve 300 in the direction perpendicular to the thickness of the cover body 100 is square centimeters, the unit of the orthographic projection area S of the cover assembly 1000 in the direction perpendicular to the thickness of the cover body 100 is also square centimeters; when the unit of the orthographic projection area S1 of the explosion-proof valve 300 in the direction perpendicular to the thickness of the cover body 100 is square meters, the unit of the orthographic projection area S of the cover assembly 1000 in the direction perpendicular to the thickness of the cover body 100 is also square meters.

[0149] In some embodiments, on the projection plane, the pole assembly 200 and the explosion-proof valve 300 are arranged in the first direction. This can facilitate the installation of a large-sized explosion-proof valve 300 on the cover body 100. The first direction mentioned above can be understood as Figure 2 The X direction shown in FIG. 1 is the radial direction of the cover plate assembly 1000 .

[0150] In some embodiments, on the projection surface, multiple connectors 230 are arranged at intervals, which can avoid the multiple connectors 230 from influencing each other during installation, reduce the difficulty of installing the multiple connectors 230, thereby ensuring the working performance of the multiple connectors 230, and achieving a high-rate overcurrent of the pole assembly 200 to ensure the working performance of the battery cell.

[0151] In some embodiments, the plurality of connectors 230 are arranged at intervals in the second direction, and the first direction intersects the second direction. That is, the arrangement direction of the pole assembly 200 and the explosion-proof valve 300 on the cover body 100 is different from the arrangement direction of the plurality of connectors 230, so that the plurality of connectors 230 and the explosion-proof valve 300 can be prevented from influencing each other during the arrangement process, thereby facilitating the arrangement of a large-sized explosion-proof valve 300 on the cover body 100, and ensuring that a plurality of connectors 230 can be arranged on the pole assembly 200, while ensuring the working performance of the explosion-proof valve 300, the conductive performance of the pole assembly 200 can also be ensured to a certain extent.

[0152] Among them, the second direction mentioned above can be understood as Figure 2 The Y direction shown in is also the radial direction of the cover plate assembly 1000 .

[0153] In addition, by arranging a plurality of connectors 230 at intervals in the second direction, the connection area between the pole assembly 200 and the current collecting plate 2000 can be increased in the second direction, thereby improving the current carrying capacity of the current collecting plate 2000 and being suitable for large-rate current carrying.

[0154] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5As shown, the cap assembly 1000 of the battery cell further includes an insulating seal 500, which is disposed between the pole assembly 200 and the cap body 100. The pole assembly 200 and the cap body 100 form an insulating seal fit, thereby preventing the pole assembly 200 and the cap body 100 from forming an electrical connection, so as to ensure the working performance of the battery cell.

[0155] In some embodiments, when the first lead-out member 210 and the second lead-out member 220 are connected in cooperation, the insulating seal 500 can be compressed, thereby forming insulation and sealing of the pole assembly 200 and the cover body 100 and ensuring the sealing effect of the insulating seal 500 .

[0156] Optionally, combined Figure 3 , Figure 4 and Figure 5 As shown, the insulating seal 500 includes an insulating member 510 and a sealing member 520, and the insulating member 510 and the sealing member 520 are arranged on opposite sides of the cover body 100, so as to arrange the insulating seal 500 between the pole assembly 200 and the cover body 100, thereby achieving insulating and sealing cooperation between the cover body 100 and the pole assembly 200, and reducing the difficulty of installing the insulating seal 500 and the cover body 100.

[0157] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the insulating member 510 is arranged on the outer side of the cover body 100, and the sealing member 520 is arranged on the inner side of the cover body 100. The insulating member 510 is injection-molded by a high-performance thermoplastic resin, such as polyphenylene sulfide, to ensure the insulating performance of the insulating member 510, so that the cover body 100 and the pole assembly 200 can effectively form an insulating interval; the sealing member 520 is made of fluororubber, EPDM rubber or fusible polytetrafluoroethylene, so that while ensuring the insulating performance of the sealing member 520, the sealing member 520 can also have a certain sealing performance, provide a sealing function for the pole assembly 200, and avoid the electrolyte in the battery cell from overflowing, so as to ensure the working performance of the battery cell.

[0158] The battery cell of the embodiment of the present utility model is described below.

[0159] like Figure 1 As shown, a battery cell according to an embodiment of the present invention includes: a shell, a pole core and a cover plate assembly 1000.

[0160] Among them, combined Figure 1 , Figure 2 and Figure 3As shown, an open accommodation cavity is formed in the shell, and the pole core is arranged in the accommodation cavity. Thus, the pole core is arranged in the shell, so that the shell can be used to protect the pole core, extend the service life of the pole core, and improve the safety of the pole core.

[0161] The cover plate assembly 1000 is the aforementioned cover plate assembly 1000, and the cover plate is arranged at the opening. In this way, while the cover plate assembly 1000 is used to block the opening of the shell, the cover plate assembly 1000 can also be arranged directly opposite the pole core, so as to realize the electrical connection between the pole column assembly 200 of the cover plate assembly 1000 and the pole core, and ensure the working performance of the pole core.

[0162] It should be noted that, since the aforementioned cover plate assembly 1000 can be provided with a large-sized explosion-proof valve 300 and the pole assembly 200 has good conductivity, the battery cell of the embodiment of the utility model can ensure the working performance and safety of the battery cell to a certain extent by adopting the aforementioned cover plate assembly 1000.

[0163] In some embodiments, the shell is formed by stamping or welding, and the shell is made of aluminum or steel.

[0164] In some embodiments, the current collecting plate 2000 is disposed in the accommodating cavity and between the cover plate assembly 1000 and the pole core, and the pole assembly 200 is electrically connected to the pole core through the current collecting plate 2000. Thus, the pole core and the pole assembly 200 are electrically connected, reducing the difficulty of connecting the pole core and the pole assembly 200.

[0165] In some embodiments, the cap plate assembly 1000 is the aforementioned cap plate assembly 1000 provided with the second lead-out piece 220, the second lead-out piece 220 is provided on the side of the cap plate body 100 facing the pole core, the second lead-out piece 220 is provided with a first surface facing the current collecting plate 2000, the current collecting plate 2000 is provided with a second surface facing the second lead-out piece 220, and the first surface and the second surface are electrically connected. Thus, the current collecting plate 2000 is electrically connected with the second lead-out piece 220, that is, the pole assembly 200 is electrically connected with the current collecting plate 2000, so as to reduce the difficulty of connecting the pole assembly 200 with the current collecting plate 2000, and further reduce the difficulty of electrically connecting the pole assembly 200 with the pole core, so as to ensure the working performance of the pole core.

[0166] It is worth noting that by utilizing the first surface and the second surface to cooperate to achieve the electrical connection between the collecting plate 2000 and the second lead-out piece 220, compared with the prior art, it is possible to avoid opening holes in the collecting plate 2000. This can reduce the difficulty of connecting the collecting plate 2000 with the pole assembly 200 while ensuring the structural strength of the collecting plate 2000. At the same time, it is beneficial to increase the connection area between the collecting plate 2000 and the pole assembly 200, thereby ensuring the connection strength between the collecting plate 2000 and the pole assembly 200 and improving the current carrying capacity of the collecting plate 2000.

[0167] In summary, the pole assembly 200 of the present application is not only provided with a plurality of connectors 230, but also utilizes the second lead-out member 220 to be directly connected to the current collecting plate 2000 with the first surface facing the current collecting plate 2000, so as to maximize the flow conducting area and realize a large current flow rate.

[0168] In some embodiments, the end face of the second end 232 of the connector 230 is electrically connected to the second surface of the current collecting plate 2000, that is, the pole assembly 200 is not only electrically connected to the current collecting plate 2000 through the second lead-out member 220, but also electrically connected to the current collecting plate 2000 through the connector 230, so as to maximize the connection area between the current collecting plate 2000 and the pole assembly 200, thereby ensuring the current carrying capacity of the current collecting plate 2000.

[0169] In some embodiments, the first surface and the second surface are connected by welding or gluing, so that the current collecting plate 2000 and the pole assembly 200 can be electrically connected, and the connection strength between the current collecting plate 2000 and the pole assembly 200 can be ensured, and the connection difficulty between the current collecting plate 2000 and the pole assembly 200 can be reduced, thereby improving the assembly efficiency and structural stability of the battery cell.

[0170] In some embodiments, in combination Figure 3 , Figure 5 and Figure 7 As shown, the collecting plate 2000 includes a first connecting portion 2030 and a second connecting portion 2040 that are connected to each other, the second connecting portion 2040 can be folded in a direction toward or away from the first connecting portion 2030, the second surface of the collecting plate 2000 is located at the second connecting portion 2040, the second connecting portion 2040 is electrically connected to the first surface of the second lead-out member 220, and the first connecting portion 2030 is electrically connected to the pole core. That is to say, after the first connection part 2030 and the second connection part 2040 are connected, the second connection part 2040 can be folded in the direction toward the first connection part 2030 (so that the first connection part 2030 and the second connection part 2040 are arranged relative to each other in the axial direction of the battery cell), and can also be folded in the direction away from the first connection part 2030 (so that the extension directions of the first connection part 2030 and the second connection part 2040 are different). In this way, when the second connection part 2040 is electrically connected to the first surface of the second lead-out member 220 and the first connection part 2030 is electrically connected to the pole core, the pole core and the pole post assembly 200 can be electrically connected to reduce the difficulty of electrical connection between the pole core and the pole post assembly 200.

[0171] At the same time, by configuring the current collecting plate 2000 to include a first connecting portion 2030 and a second connecting portion 2040 that are connected to each other, the first connecting portion 2030 and the second connecting portion 2040 can change their relative positions under the action of an external force, thereby forming a buffer during the connection process between the current collecting plate 2000 and the pole assembly 200, thereby ensuring the contact area between the current collecting plate 2000 and the pole assembly 200 and improving the connection strength.

[0172] In a specific example, when it is necessary to electrically connect the pole assembly 200 with the pole core, the first connection portion 2030 of the collecting plate 2000 can be electrically connected to the pole core first, and the second connection portion 2040 of the collecting plate 2000 can be electrically connected toward the second surface of the pole assembly 200 with the first surface of the pole assembly 200. After the electrical connection is completed, the second connection portion 2040 is folded toward or away from the first connection portion 2030 to achieve bending of the collecting plate 2000, so that the cover plate assembly 1000 is arranged at the opening of the shell, the shell is sealed, and the pole core is flexibly buffered to ensure the working performance of the battery cell.

[0173] At the same time, since the pole assembly 200 of the present application includes a plurality of connectors 230 spaced apart in the second direction, during the manufacturing process of the collecting plate 2000, the width of the second connecting portion 2040 of the collecting plate 2000 in the second direction can be adaptively adjusted, thereby increasing the flow guide cross-section of the second connecting portion 2040, which is suitable for large-rate current flow.

[0174] In some embodiments, the battery cell is formed as a cylindrical battery, the middle of the pole core has a central hole, and the cover body 100 is provided with an explosion-proof valve 300; in the thickness direction of the cover body 100, at least part of the explosion-proof valve 300 is arranged opposite to the central hole. It should be noted that, because the central hole of the pole core has a certain size, after the battery cell is filled with liquid, part of the electrolyte will remain in the central hole of the pole core. When the battery cell has thermal runaway, the electrolyte in the central hole will release a large amount of gas by heat decomposition. By arranging at least part of the explosion-proof valve 300 opposite to the central hole, it can be ensured that a large amount of gas in the central hole can be quickly discharged, so that the gas in the battery cell can be quickly discharged, thereby improving the safety of the battery cell.

[0175] In some embodiments, the battery cell is formed as a cylindrical battery, the middle of the pole core has a central hole, and the cover body 100 is provided with an explosion-proof valve 300; in the thickness direction of the cover body 100, the explosion-proof valve 300 is arranged opposite to part of the central hole. Here, it means that in the thickness direction of the cover body 100, not the entire structure of the central hole is opposite to the explosion-proof valve 300, but part of the structure of the central hole is opposite to the explosion-proof valve 300, so that the explosion-proof valve 300 can be offset relative to the center of the cover body 100, while avoiding the explosion-proof valve 300 from occupying too much space on the cover body 100, and it can also make a certain distance between the pole assembly 200 and the explosion-proof valve 300, and ensure that a large amount of gas in the central hole can be quickly discharged.

[0176] The battery pack according to an embodiment of the present invention is described below.

[0177] A battery pack according to an embodiment of the present invention includes: a plurality of battery cells.

[0178] The battery cell is the aforementioned battery cell, and the specific structure of the battery cell is not described in detail here.

[0179] It should be noted that, since the aforementioned battery cell is provided with a cover plate assembly 1000 , the battery pack of the embodiment of the utility model can ensure the working performance of the battery pack to a certain extent by adopting the aforementioned battery cell.

[0180] The electrical device of the embodiment of the utility model is described below.

[0181] An electrical device according to an embodiment of the utility model includes: a battery cell or a battery pack.

[0182] The battery cell is the aforementioned battery cell, and the specific structure of the battery cell is not described in detail here. The battery pack is also the aforementioned battery pack, and the specific structure of the battery pack is not described in detail here.

[0183] It should be noted that, since the aforementioned battery cell or battery pack is provided with a cover plate assembly 1000 , the electrical device of the embodiment of the utility model can ensure the working performance of the electrical device to a certain extent by adopting the aforementioned battery cell or battery pack.

[0184] It should also be noted that the electrical devices mentioned here can be but are not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery vehicles, electric vehicles, ships, spacecraft, etc.

[0185] Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys; spacecraft may include airplanes, rockets, space shuttles and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0186] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0187] Figure 5 Two connectors 230 are shown for illustrative purposes, but after reading the above technical solution, ordinary technicians can obviously understand that the solution can be applied to a technical solution with three or more connectors 230, which also falls within the protection scope of the present utility model.

[0188] The cover plate assembly 1000 of the battery cell, the battery cell, the battery pack and other components of the electrical device according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0189] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0190] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly for a battery cell, characterized in that: include: Cover plate body; A pole assembly, wherein the pole assembly is arranged on the cover body, and on the same projection plane, the orthographic projection of the pole assembly deviates from the center of the outer contour of the orthographic projection of the cover body, wherein the projection plane is perpendicular to the thickness direction of the cover body; The pole assembly includes a first lead-out piece and a plurality of connectors, wherein the first lead-out piece is arranged on one side of the cover body in the thickness direction, and the connector is penetrated through the cover body and electrically connected to the first lead-out piece.

2. The cover plate assembly of the battery cell according to claim 1, characterized in that: The pole assembly further includes a second lead-out member, the second lead-out member and the first lead-out member are respectively arranged on both sides of the thickness direction of the cover plate body, and the connecting member is respectively fixedly and electrically connected to the first lead-out member and the second lead-out member.

3. The cover plate assembly of the battery cell according to claim 2, characterized in that: Along the thickness direction of the cover body, each of the connectors includes a first end close to the first lead-out piece and a second end close to the second lead-out piece, a plurality of the connectors penetrate into the first lead-out piece and the first end of each of the connectors does not exceed the end surface of the first lead-out piece on the side facing away from the cover body, a plurality of the connectors penetrate into the second lead-out piece and the second end of each of the connectors does not exceed the end surface of the second lead-out piece on the side facing away from the cover body.

4. The cover plate assembly of a battery cell according to any one of claims 1 to 3, characterized in that: It also includes an explosion-proof valve, which is arranged on the cover body. The side of the orthographic projection outer contour of the pole assembly close to the center of the orthographic projection outer contour of the cover body is the first side, and the orthographic projection of the explosion-proof valve is arranged close to the first side.

5. The cover plate assembly of the battery cell according to claim 4, characterized in that: On the projection surface, the minimum distance between the orthographic outer contour of the explosion-proof valve and the center of the orthographic outer contour of the cover body is a first distance, and the minimum distance between the orthographic outer contour of the pole assembly and the center of the orthographic outer contour of the cover body is a second distance, and the first distance is smaller than the second distance.

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

7. The cover plate assembly of the battery cell according to claim 1, characterized in that: On the projection surface, a plurality of the connecting members are arranged at intervals.

8. The cover plate assembly of the battery cell according to claim 1, characterized in that: An insulating seal is also included, and the insulating seal is arranged between the pole assembly and the cover plate body.

9. A battery cell, characterized in that: include: A housing, wherein an open accommodating cavity is formed in the housing; A pole core, the pole core being arranged in the accommodating cavity; A cover plate assembly, wherein the cover plate assembly is the cover plate assembly according to any one of claims 1-8, and the cover plate is arranged at the opening.

10. The battery cell according to claim 9, characterized in that: The first lead-out member is arranged on a side of the cover plate body away from the pole core.

11. The battery cell according to claim 10, characterized in that: The battery cell further includes a current collecting plate, which is disposed in the accommodating cavity and between the cover plate assembly and the pole core. The pole column assembly is electrically connected to the pole core via the current collecting plate.

12. The battery cell according to claim 11, characterized in that: The cover plate assembly is the cover plate assembly according to claim 2 or 3, the second lead-out piece is arranged on the side of the cover plate body facing the pole core, the second lead-out piece is provided with a first surface facing the collecting disk, the collecting disk is provided with a second surface facing the second lead-out piece, and the first surface and the second surface are electrically connected.

13. The battery cell according to claim 12, characterized in that: The first surface and the second surface are electrically connected by welding or gluing.

14. The battery cell according to claim 12, characterized in that: The current collecting plate includes a first connecting portion and a second connecting portion connected to each other, the second connecting portion can be folded in a direction toward or away from the first connecting portion, the second surface of the current collecting plate is located at the second connecting portion, the second connecting portion is electrically connected to the first surface of the second lead-out piece, and the first connecting portion is electrically connected to the pole core.

15. The battery cell according to any one of claims 9 to 14, characterized in that: The battery cell is formed as a cylindrical battery, the middle of the pole core has a central hole, and the cover body is provided with an explosion-proof valve; In the thickness direction of the cover plate body, at least a portion of the explosion-proof valve is arranged opposite to the central hole.

16. The battery cell according to any one of claims 9 to 14, characterized in that: The battery cell is formed as a cylindrical battery, the middle of the pole core has a central hole, and the cover body is provided with an explosion-proof valve; In the thickness direction of the cover plate body, the explosion-proof valve is arranged opposite to a portion of the central hole.

17. A battery pack, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 9 to 16.

18. An electrical device, characterized in that: The invention comprises a battery cell according to any one of claims 9 to 16 or a battery pack according to claim 17.

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