Battery monomer, battery pack and power utilization device

Abstract

The utility model discloses a battery monomer, battery pack and power utilization device, the battery monomer includes shell, pole subassembly, pole shank and collector plate, the shell includes shell and cover plate, forms the accommodation cavity of opening in the shell, the cover plate is provided in the opening, pole subassembly is provided in the cover plate, the pole subassembly is provided in the extension space towards the accommodation cavity opening, the extension space is provided with the pole shank and the collector plate. The pole core is arranged in the containing cavity, the current collecting disc is arranged between the pole core and the cover plate and electrically connected with the pole core, and at least part of the current collecting disc is located in the stretching-in space so as to be electrically connected with the pole column assembly. According to the battery monomer disclosed by the embodiment of the utility model, the stretching-in space facing the opening of the accommodating cavity is arranged in the pole component, and at least part of the current collecting plate is arranged in the stretching-in space and is electrically connected with the pole component, so that the electric connection difficulty of the current collecting plate and the pole component can be reduced, and the assembly difficulty of the battery monomer is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery monomer, 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 parts, a pole assembly electrically connected to the pole core is usually provided on the cover plate of the battery cell, and a current collecting plate is provided between the pole assembly and the pole core to achieve electrical connection between the pole assembly and the pole core.

[0003] However, the electrical connection process between the existing collector plate and the pole assembly is relatively complicated, which increases the difficulty of electrical connection between the pole assembly and the pole core, thereby increasing the difficulty of assembling the battery cell. 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 first purpose of the utility model is to provide a battery cell, which can reduce the difficulty of electrical connection between the collector plate and the pole assembly, solving the technical problem of the difficulty of electrical connection between the pole assembly and the collector plate in the prior art.

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

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

[0007] According to the battery cell of the embodiment of the utility model, it includes: an outer shell, the outer shell includes a shell and a cover plate, an open accommodating cavity is formed in the shell, and the cover plate is arranged at the opening; a pole assembly, the pole assembly is arranged on the cover plate, and an extending space toward the opening of the accommodating cavity is provided in the pole assembly; a pole core, the pole core is arranged in the accommodating cavity; a current collecting plate, the current collecting plate is arranged between the pole core and the cover plate and is electrically connected to the pole core, and at least a part of the current collecting plate is located in the extending space to be electrically connected to the pole assembly.

[0008] According to the battery cell of the embodiment of the utility model, an extension space toward the accommodating cavity opening is provided in the pole assembly and at least a portion of the current collecting plate is provided in the extension space and electrically connected to the pole assembly. In this way, while realizing the electrical connection between the current collecting plate and the pole assembly, the difficulty of electrical connection between the current collecting plate and the pole assembly can also be reduced, thereby reducing the difficulty of assembling the battery cell and facilitating improving the assembly efficiency of the battery cell.

[0009] In some embodiments, the current collecting disk includes a disk body and a connecting protrusion protruding toward the pole assembly, the disk body is connected to the pole core, the connecting protrusion is connected to the disk body and at least part of the connecting protrusion is located in the extending space, and the connecting protrusion is electrically connected to the pole assembly.

[0010] In some embodiments, the connecting protrusion includes a first portion and a second portion, the first portion is electrically connected to the pole assembly, and the second portion is connected between the first portion and the disk body.

[0011] In some embodiments, the second part includes a first support plate and a second support plate arranged opposite to each other in a first direction, two ends of the first part are respectively connected to the first support plate and the second support plate, and a dimension of the first part along the first direction is greater than a distance between the first support plate and the second support plate.

[0012] In some embodiments, the first support plate and the first portion are connected via at least one circular arc segment, and / or the second support plate and the first portion are connected via at least one circular arc segment.

[0013] In some embodiments, one of the first support plate and the second support plate is formed as an integral piece with the disk body, and the other is welded to the disk body.

[0014] In some embodiments, the first support plate and the disk body are formed as an integral piece, the second support plate includes a first plate body and a second plate body connected to the first plate body at an angle, the first plate body extends toward the pole assembly, the second plate body is connected to a side of the first plate body close to the disk body and is welded to a surface of the disk body facing the cover plate.

[0015] In some embodiments, the first support plate and the disk body are connected via at least one arc segment, and / or the first plate body of the second support plate and the second plate body of the second support plate are connected via at least one arc segment.

[0016] In some embodiments, the connecting protrusion is formed by bending.

[0017] In some embodiments, the pole assembly includes: a connecting portion, which is arranged on the side of the cover plate facing away from the accommodating cavity and is insulated and connected to the cover plate; a hollow fixing cylinder, which is passed through the cover plate and is insulated and fixed to the cover plate, the extension space is defined in the fixing cylinder, the side of the fixing cylinder facing away from the accommodating cavity is connected to the connecting portion, and at least a portion of the collecting plate is located in the fixing cylinder and is electrically connected to the connecting portion.

[0018] In some embodiments, the connecting portion includes a connecting ring and a connecting plate, the connecting ring is sleeved on the outer periphery of the fixed tube, the connecting plate is fixed to the side of the connecting ring facing away from the cover plate to seal the connecting ring, and at least a portion of the collecting plate is located in the fixed tube and is electrically connected to the connecting plate.

[0019] In some embodiments, the battery cell also includes an insulating seal, which is arranged between the cover plate and the pole assembly to insulate and connect the cover plate and the pole assembly. The outer peripheral wall of the fixing tube is provided with a limiting groove, and at least a portion of the connecting ring and the insulating seal are arranged in the limiting groove.

[0020] In some embodiments, the battery cell also includes an explosion-proof valve, which is arranged on the cover plate. On the same projection plane, the orthographic outer contour of the pole assembly deviates from the center of the orthographic outer contour of the cover plate, and the side of the orthographic outer contour of the pole assembly close to the center of the orthographic outer contour of the cover plate is the first side, and the orthographic projection of the explosion-proof valve is arranged close to the first side, wherein the projection plane is perpendicular to the thickness direction of the cover plate.

[0021] In some embodiments, the battery cell is formed as a cylindrical battery, and on the projection plane, the orthographic projection of the explosion-proof valve is close to the center of the outer contour of the orthographic projection of the cover plate, and in the thickness direction of the cover plate, the explosion-proof valve is arranged opposite to at least part of the center hole of the pole core.

[0022] In some embodiments, the orthographic projection of the explosion-proof valve covers the center of the orthographic projection outer contour of the cover plate, and at least a portion of the explosion-proof valve is arranged opposite to the central hole.

[0023] In some embodiments, on the projection plane, the orthographic outer contour of the explosion-proof valve and the orthographic outer contour of the pole assembly are spaced apart, and the minimum spacing ranges from 5 mm to 15 mm.

[0024] In some embodiments, on the projection plane, the minimum distance between the orthographic projection outer contour of the explosion-proof valve and the orthographic projection outer contour of the cover plate is in the range of 3mm to 10mm; and / or, on the projection plane, the minimum distance between the orthographic projection outer contour of the pole assembly and the orthographic projection outer contour of the cover plate is in the range of 3mm to 10mm.

[0025] The battery pack according to the embodiment of the present invention includes a plurality of the aforementioned battery cells.

[0026] According to the battery pack of the embodiment of the present invention, by adopting the aforementioned battery monomer, the manufacturing difficulty of the battery pack can be reduced and the working performance of the battery pack can be guaranteed.

[0027] The electric device according to the embodiment of the present invention includes the aforementioned battery cell or battery pack.

[0028] According to the electric device of the embodiment of the utility model, by adopting the aforementioned battery cell or battery pack, the manufacturing difficulty of the electric device can be reduced and the working performance of the electric device can be guaranteed.

[0029] 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

[0030] 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:

[0031] Figure 1 It is a schematic diagram of the partial structure of a battery cell of some embodiments of the first aspect of the utility model.

[0032] Figure 2 It is a top view of a partial structure of a battery cell of some embodiments of the first aspect of the utility model.

[0033] Figure 3 It is an exploded view of a part of the structure of a battery cell in some embodiments of the second aspect of the utility model.

[0034] Figure 4 It is a cross-sectional view of a partial structure of a battery cell in some embodiments of the second aspect of the utility model.

[0035] Figure 5 for Figure 4 A partial enlarged view of area Ⅰ in the middle.

[0036] Figure 6 Schematic diagram of current collecting plates according to some embodiments of the present invention.

[0037] Figure 7 It is a schematic diagram of the partial structure of a battery cell in some embodiments of the second aspect of the utility model.

[0038] Figure 8 It is a top view of a partial structure of a battery cell in some embodiments of the second aspect of the utility model.

[0039] Fig. 9 It is a top view of a partial structure of a battery cell in some embodiments of the third aspect of the utility model.

[0040] Fig.10 It is a top view of the partial structure of a battery cell in some embodiments of the fourth aspect of the utility model.

[0041] Fig.11It is a top view of the partial structure of a battery cell of some embodiments of the fifth aspect of the utility model.

[0042] Reference numerals:

[0043] 1000, battery cell;

[0044] 100, cover plate;

[0045] 110, through hole; 120, first communicating hole;

[0046] 130, first surface; 140, second surface;

[0047] 200, pole assembly;

[0048] 210. Reaching into space;

[0049] 220, connecting part;

[0050] 221, connecting ring; 222, connecting plate;

[0051] 230, fixed cylinder;

[0052] 300, explosion-proof valve;

[0053] 320, explosion-proof valve body; 310, thinning area;

[0054] 400, protective film;

[0055] 500, insulation seal;

[0056] 510, insulating member; 511, insulating portion; 512, sealing portion;

[0057] 520, seals;

[0058] 600, collecting plate;

[0059] 610, disk body; 611, second communication hole;

[0060] 620, connecting protrusion;

[0061] 621, Part I;

[0062] 622, Part II;

[0063] 6221, first support plate;

[0064] 6222, second support plate; 6223, first plate body; 6224, second plate body. DETAILED DESCRIPTION

[0065] 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.

[0066] 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.

[0067] The battery cell 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0068] Combination Figure 1 , Figure 2 and Figure 3 As shown, the battery cell 1000 according to the embodiment of the present invention includes: a housing, a pole assembly 200 , a pole core and a current collecting plate 600 .

[0069] The housing includes a shell and a cover plate 100, an open accommodation cavity is formed in the shell, and the cover plate 100 is arranged at the opening, so as to realize the use of the cover plate 100 to block the opening of the shell, thereby realizing the formation of a closed accommodation cavity in the shell.

[0070] In some embodiments, the shell is formed by stamping or welding, and the shell is made of aluminum or steel.

[0071] Combination Figure 1 , Figure 2 and Figure 4 As shown, the pole assembly 200 is arranged on the cover plate 100, and an insertion space 210 is arranged in the pole assembly 200, and the insertion space 210 opens toward the accommodating cavity. It should be noted that by arranging the insertion space 210 in the pole assembly 200 and arranging the insertion space 210 to open toward the accommodating cavity, it is mainly used to avoid the structural member (such as the collecting plate 600) facing the insertion space 210.

[0072] The pole core is arranged in the accommodating cavity (not shown in the figure). Thus, the pole core is arranged in the shell, so as to protect the pole core by the shell, prolong the service life of the pole core, and improve the safety of the pole core.

[0073] It should also be noted that, since the pole core is arranged in the accommodating cavity, by arranging the cover plate 100 at the opening of the accommodating cavity, it can be ensured that after the cover plate 100 is assembled, the pole assembly 200 arranged on the cover plate 100 can be arranged directly opposite the pole core, thereby facilitating the electrical connection between the pole assembly 200 and the pole core and reducing the difficulty of the electrical connection between the pole assembly 200 and the pole core.

[0074] Combination Figure 1 , Figure 3 and Figure 4 As shown, the current collecting plate 600 is disposed between the pole core and the cover plate 100 and is electrically connected to the pole core, and at least part of the current collecting plate 600 is located in the extending space 210 to be electrically connected to the pole assembly 200. In other words, the current collecting plate 600 is electrically connected to the pole core and the pole assembly 200, respectively, so that the pole core and the pole assembly 200 are electrically connected, reducing the difficulty of connecting the pole core and the pole assembly 200.

[0075] At the same time, by disposing at least part of the current collecting plate 600 in the extending space 210 and electrically connecting with the pole assembly 200 , the difficulty of electrical connection between the current collecting plate 600 and the pole assembly 200 can be effectively reduced, the connection efficiency can be improved, and thus the manufacturing efficiency of the battery cell 1000 can be improved.

[0076] In some embodiments, when at least a portion of the current collecting plate 600 is arranged to be arranged in the extending space 210 through the opening toward the accommodating cavity, the current collecting plate 600 and the pole assembly 200 can be welded by laser penetration welding, so as to realize fusion welding of the pole assembly 200 and the current collecting plate 600, ensuring that the current collecting plate 600 and the pole assembly 200 can be effectively connected to realize current flow, and at the same time, it can also ensure the connection strength between the pole assembly 200 and the current collecting plate 600, and reduce the difficulty of connecting the pole assembly 200 and the current collecting plate 600.

[0077] In some embodiments, the collecting plate 600 is welded to the pole core to achieve electrical connection between the collecting plate 600 and the pole core, thereby forming an electrical connection between the pole assembly 200 and the pole core and ensuring the connection strength between the collecting plate 600 and the pole core.

[0078] It can be seen from the above structure that the battery cell 1000 of the embodiment of the utility model can reduce the connection strength between the pole assembly 200 and the current collecting plate 600, so that the pole assembly 200 and the current collecting plate 600 can be effectively electrically connected and the connection quality is guaranteed, ensuring that the current can flow between the current collecting plate 600 and the pole assembly 200, thereby ensuring the working performance of the battery cell 1000.

[0079] It can be understood that, compared with the prior art, the present application creatively adjusts the structure of the pole assembly 200 to reduce the connection strength between the pole assembly 200 and the current collecting plate 600 , thereby reducing the difficulty of assembling the battery cell 1000 .

[0080] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the cover plate 100 is provided with a first connecting hole 120, and the pole assembly 200 is arranged in the first connecting hole 120, so that the pole assembly 200 is arranged on the cover plate 100, which is convenient for supporting the pole assembly 200 by the cover plate 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 plate 100.

[0081] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the current collecting disc 600 includes a disc body 610 and a connecting protrusion 620, the disc body 610 is connected to the pole core, the connecting protrusion 620 protrudes toward the pole assembly 200, the connecting protrusion 620 is connected to the disc body 610 and at least part of the connecting protrusion 620 is located in the extending space 210, and the connecting protrusion 620 is electrically connected to the pole assembly 200. Thus, the current collecting disc 600 is electrically connected to the pole core and the pole assembly 200 respectively, so as to realize the electrical connection between the pole core and the pole assembly 200, and reduce the difficulty of connecting the pole core and the pole assembly 200.

[0082] At the same time, by setting a connecting protrusion 620 protruding toward the pole assembly 200, and setting at least a portion of the connecting protrusion 620 to be located in the extending space 210, it is possible to set at least a portion of the collecting plate 600 to be located in the extending space 210 to form an electrical connection with the pole assembly 200, thereby reducing the difficulty of connecting the collecting plate 600 and the pole assembly 200, and can also reduce the steps of folding the collecting plate 600 in multiple steps in the prior art, making the process of the collecting plate 600 simpler, thereby reducing the manufacturing difficulty and manufacturing cost of the collecting plate 600, thereby reducing the manufacturing cost of the battery cell 1000.

[0083] In a specific example, during the assembly process of the collecting plate 600 and the pole assembly 200, the connecting protrusion 620 of the collecting plate 600 is pressed flat and fitted with the pole assembly 200 toward one side of the pole assembly 200, and then laser penetration welding is used to realize the electrical connection between the collecting plate 600 and the pole assembly 200, thereby eliminating the process of setting the lead-out plate of the collecting plate 600 in the prior art, thereby simplifying the process steps.

[0084] In summary, the present application provides an extension space 210 toward the accommodating cavity opening in the pole assembly 200 and configures the collecting plate 600 to include a connecting protrusion 620 protruding toward the pole assembly 200, so that at least a portion of the connecting protrusion 620 can be extended into the extension space 210, and the extension space 210 and the connecting protrusion 620 cooperate to achieve penetration welding between the pole assembly 200 and the collecting plate 600.

[0085] In some embodiments, Figure 5 As shown, the extension space 210 is open toward one side of the collecting plate 600, so that the extension space 210 is open toward the accommodating cavity, so that at least a portion of the connecting protrusion 620 can be effectively arranged in the extension space 210, thereby realizing the penetration welding of the pole assembly 200 and the collecting plate 600, reducing the welding difficulty of the pole assembly 200 and the collecting plate 600.

[0086] In some embodiments, in combination Figure 4 , Figure 5 and Figure 6 As shown, the connection protrusion 620 includes a first part 621 and a second part 622, the first part 621 is electrically connected to the pole assembly 200, and the second part 622 is connected between the first part 621 and the disk body 610. In this way, not only can the first part 621 be supported by the second part 622 to improve the position stability of the first part 621, but also the connection protrusion 620 can be protruded toward the pole assembly 200, thereby ensuring that the first part 621 can be effectively electrically connected to the pole assembly 200, so that when the disk body 610 is connected to the pole core, the pole assembly 200 can be electrically connected to the pole core, so that the current of the pole core can be drawn out by the pole assembly 200, thereby ensuring the working performance of the pole core.

[0087] 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.

[0088] In some embodiments, Figure 5 and Figure 6 As shown, the second part 622 includes a first support plate 6221 and a second support plate 6222 arranged opposite to each other in the first direction, and the two ends of the first part 621 are connected to the first support plate 6221 and the second support plate 6222 respectively. The first direction mentioned here can be understood as Figure 3 In the X direction shown in the figure, by connecting the two ends of the first part 621 to the first support plate 6221 and the second support plate 6222 respectively, the second part 622 can support the two ends of the first part 621 at the same time, so as to ensure the supporting strength of the second part 622 to the first part 621, improve the position stability of the first part 621, thereby ensuring the quality of the electrical connection between the first part 621 and the pole assembly 200, and avoid the first part 621 from tilting during the connection process between the first part 621 and the pole assembly 200, so as to ensure the balance of the welding surface of the collecting plate 600.

[0089] At the same time, compared with only one support plate, the cooperation between the first support plate 6221 and the second support plate 6222 can increase the current flow capacity of the second part 622, thereby improving the current flow capacity of the collecting plate 600 to achieve the performance requirements of high-rate charging and discharging of the battery cell 1000.

[0090] In some embodiments, in combination Figure 4 , Figure 5 and Figure 6 As shown, the size of the first part 621 along the first direction is greater than the distance between the first support plate 6221 and the second support plate 6222. It can also be understood here that the size of the first part 621 in the first direction is greater than the distance between the first support plate 6221 and the second support plate 6222 in the first direction.

[0091] The size of the first portion 621 in the first direction can be understood as Figure 5 In W1, the distance between the first support plate 6221 and the second support plate 6222 in the first direction can be understood as Figure 5 W2 in.

[0092] Through the above-mentioned arrangement, it can be ensured that the first part 621 has a sufficient width, so that when the first part 621 is electrically connected to the pole assembly 200, the connection area between the first part 621 and the pole assembly 200 can be guaranteed. While improving the connection strength between the first part 621 and the pole assembly 200, the current flow capacity of the collecting plate 600 can also be improved, thereby ensuring the working performance of the collecting plate 600 to a certain extent.

[0093] In some embodiments, Figure 5 and Figure 6 As shown, the first support plate 6221 and the first part 621 are connected by at least one arc segment, and / or the second support plate 6222 and the first part 621 are connected by at least one arc segment. That is to say, the first support plate 6221 and the first part 621 can be connected by at least one arc segment, and the second support plate 6222 and the first part 621 can also be connected by at least one arc segment, or the first support plate 6221 and the first part 621 and the second support plate 6222 and the first part 621 can be connected by at least one arc segment at the same time, so that on the one hand, stress concentration of the connecting protrusion 620 can be avoided to extend the service life of the connecting protrusion 620, and on the other hand, the first part 621 can be moved and deformed under the action of external force, so that the first part 621 can effectively fit the pole assembly 200, thereby ensuring the connection area between the first part 621 and the pole assembly 200 to a certain extent, and improving the connection quality.

[0094] That is to say, by connecting the first support plate 6221 and the first part 621 and / or the second support plate 6222 and the first part 621 through at least one arc segment, the welding surface of the current collecting plate 600 can effectively fit and compact the pole assembly 200 under elastic compression, so that a buffer can be formed during the connection process of the current collecting plate 600 and the pole assembly 200, thereby facilitating the contact area between the current collecting plate 600 and the pole assembly 200 and improving the connection strength.

[0095] In a specific example, Figure 5 and Figure 6 As shown, the first support plate 6221 and the first part 621 as well as the second support plate 6222 and the first part 621 are connected via at least one arc segment.

[0096] In some embodiments, in combination Figure 4 , Figure 5 and Figure 6 As shown, one of the first support plate 6221 and the second support plate 6222 is formed as an integral part with the disc body 610, and the other is welded to the disc body 610. Thus, the first support plate 6221 and the second support plate 6222 can be fixedly connected to the disc body 610 at the same time, and the difficulty of connecting the first support plate 6221 and the second support plate 6222 with the disc body 610 is reduced, and the connection quality of the first support plate 6221 and the second support plate 6222 with the disc body 610 can be ensured, which is conducive to improving the position stability of the first support plate 6221 and the second support plate 6222, so that it is convenient to use the first support plate 6221 and the second support plate 6222 to cooperate with each other to support the first part 621, improve the position stability of the first part 621, and improve the current capacity of the current collecting disc 600, so as to achieve the performance requirements of high-rate charging and discharging of the battery cell 1000.

[0097] In a specific example, combined with Figure 4 , Figure 5 and Figure 6 As shown, the first support plate 6221 and the disk body 610 are formed as an integral piece, and the second support plate 6222 and the disk body 610 are welded.

[0098] In some embodiments, in combination Figure 4 , Figure 5 and Figure 6As shown, the first support plate 6221 and the disk body 610 are formed as an integral piece, the second support plate 6222 includes a first plate body 6223 and a second plate body 6224, the second plate body 6224 is connected to the first plate body 6223 at an angle, the first plate body 6223 extends toward the pole assembly 200, the second plate body 6224 is connected to the side of the first plate body 6223 close to the disk body 610 and the second plate body 6224 is welded to the surface of the disk body 610 facing the cover plate 100. Among them, the second plate body 6224 and the first plate body 6223 are connected at an angle, which can be understood as the extension direction of the second plate body 6224 and the first plate body 6223 are different, and after the first plate body 6223 extends toward the pole assembly 200, the first plate body 6223 has a side close to the pole assembly 200 and a side close to the disk body 610. When the second plate body 6224 is connected to the side of the first plate body 6223 close to the disk body 610, the second plate body 6224 can be arranged close to the disk body 610, so as to facilitate the fixed connection between the second plate body 6224 and the disk body 610. In this way, when the disk body 610 is connected to the pole core, the electrical connection between the pole core and the pole core can be realized, so that the current of the pole core can be drawn out by using the pole assembly 200, thereby ensuring the working performance of the pole core.

[0099] At the same time, by welding the second plate body 6224 to the side surface of the disk body 610 facing the cover plate 100, the second plate body 6224 and the disk body 610 can be fixedly connected, and the connection strength between the second plate body 6224 and the disk body 610 can be ensured, thereby improving the connection quality, thereby ensuring the connection quality between the second support plate 6222 and the disk body 610, improving the structural stability of the collecting plate 600, and ensuring the working performance of the collecting plate 600.

[0100] Of course, in some other embodiments, the side of the second plate body 6224 close to the disk body 610 may also be bonded to the surface of the disk body 610 facing the cover plate 100 .

[0101] In some embodiments, in combination Figure 4 , Figure 5 and Figure 6As shown, the first support plate 6221 and the disk body 610 are connected via at least one arc segment, and / or the first plate body 6223 of the second support plate 6222 and the second plate body 6224 of the second support plate 6222 are connected via at least one arc segment. That is to say, the first support plate 6221 and the disk body 610 can be connected by at least one arc segment, the first plate body 6223 of the second support plate 6222 and the second plate body 6224 of the second support plate 6222 can be connected by at least one arc segment, or the first support plate 6221 and the disk body 610 and the first plate body 6223 of the second support plate 6222 and the second plate body 6224 of the second support plate 6222 can be connected by at least one arc segment. This can avoid stress concentration on the connecting protrusion 620 and the current collecting disk 600 to extend the service life of the current collecting disk 600 on the one hand, and can also enable the first part 621 to move and deform under the action of external force, so that the first part 621 can effectively fit the pole assembly 200, thereby ensuring the connection area between the first part 621 and the pole assembly 200 to a certain extent and improving the connection quality.

[0102] That is to say, by connecting the first support plate 6221 and the disk body 610 and / or the first plate body 6223 and the second plate body 6224 of the second support plate 6222 through at least one arc segment, the welding surface of the current collecting plate 600 can effectively fit and compact the pole assembly 200 under elastic compression, so that a buffer can be formed during the connection process of the current collecting plate 600 and the pole assembly 200, thereby facilitating the ensuring of the contact area between the current collecting plate 600 and the pole assembly 200 and improving the connection strength.

[0103] In a specific example, Figure 5 and Figure 6 As shown, the first support plate 6221 and the disk body 610 as well as the first plate body 6223 of the second support plate 6222 and the second plate body 6224 of the second support plate 6222 are connected via at least one arc segment.

[0104] In some embodiments, the connection protrusion 620 is bent to reduce the difficulty of forming the connection protrusion 620 , while also avoiding the connection protrusion 620 from being stretched and cracked, thereby extending the service life of the connection protrusion 620 and ensuring the working performance of the connection protrusion 620 .

[0105] In some embodiments, the connection protrusion 620 is formed by bending and flipping at least a portion of the current collecting disc 600. It can also be understood that after bending and flipping at least a portion of the current collecting disc 600, at least a portion of the structure of the current collecting disc 600 is formed into the connection protrusion 620, and at least a portion of the current collecting disc 600 that is not bent and flipped is formed into the disc body 610, so that the disc body 610 and the connection protrusion 620 can be formed into an integral piece, so that the current collecting disc 600 is formed into an integral piece, which reduces the difficulty of forming the connection protrusion 620 while ensuring the connection strength between the connection protrusion 620 and the disc body 610, thereby improving the position stability of the connection protrusion 620 and ensuring the working performance of the connection protrusion 620.

[0106] It is worth noting that the current collecting plate 600 of the present application does not need to be provided with the lead-out plates in the prior art through the above-mentioned configuration, thereby eliminating the process of forming the lead-out plates. This simplifies the manufacturing process of the current collecting plate 600 and can also reduce the manufacturing cost of the current collecting plate 600, thereby reducing the manufacturing cost of the battery cell 1000.

[0107] In summary, the current collecting plate 600 of the present application adopts multiple bending and flipping to form a structural part (connecting protrusion 620) that cooperates with the pole assembly 200 to reduce the difficulty of forming the connecting protrusion 620. At the same time, during the connection process, the connecting protrusion 620 is reversely pressed toward the direction of the plate body 610 for welding to ensure the connection area between the current collecting plate 600 and the pole assembly 200, and to increase the balance of the welding surface of the current collecting plate 600, and to achieve double current flow.

[0108] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the pole assembly 200 includes a connecting portion 220 and a hollow fixing cylinder 230, the connecting portion 220 is arranged on the side of the cover plate 100 facing away from the accommodating cavity and is insulated and connected to the cover plate 100, the fixing cylinder 230 is penetrated through the cover plate 100 and is insulated and fixed to the cover plate 100, an insertion space 210 is defined in the fixing cylinder 230, and the side of the fixing cylinder 230 facing away from the accommodating cavity is connected to the connecting portion 220, and at least part of the current collecting disc 600 is located in the fixing cylinder 230 and is electrically connected to the connecting portion 220. Thus, the electrical connection between the current collecting disc 600 and the pole assembly 200 is realized, and at the same time, by arranging at least part of the current collecting disc 600 in the insertion space 210 and electrically connecting to the connecting portion 220, the difficulty of electrical connection between the current collecting disc 600 and the pole assembly 200 is reduced, the connection efficiency is improved, and thus the manufacturing efficiency of the battery cell 1000 is improved.

[0109] In addition, by insulating the connection portion 220 and the cover plate 100 , an electrical connection between the connection portion 220 and the cover plate 100 can be avoided, thereby improving the safety of the battery cell 1000 .

[0110] It should be noted that by arranging the connecting portion 220 on the side of the cover plate 100 facing away from the accommodating cavity, the connecting portion 220 can be arranged on the outside of the outer shell, so that it is convenient to use the connecting portion 220 to realize the electrical connection between the pole assembly 200 and the external structural parts, thereby reducing the difficulty of electrical connection between the pole assembly 200 and the external structural parts, thereby facilitating the extraction of the current of the pole core.

[0111] At the same time, by defining an insertion space 210 in the fixing cylinder 230, the insertion space 210 is provided in the pole assembly 200, and the difficulty of forming the insertion space 210 is reduced, thereby reducing the difficulty of electrically connecting the collecting plate 600 and the pole assembly 200; by passing the fixing cylinder 230 through the cover plate 100 and insulated and fixed to the cover plate 100, while realizing the pole assembly 200 being arranged on the cover plate 100, the insulation matching of the pole assembly 200 and the cover plate 100 can also be realized, thereby avoiding the pole assembly 200 and the cover plate 100 from forming an electrical connection to ensure the working performance of the battery cell 1000; by connecting the end of the fixing cylinder 230 away from the accommodating cavity with the connecting portion 220, a fixed connection between the fixing cylinder 230 and the connecting portion 220 is realized, so that the fixing cylinder 230 is used to support the connecting portion 220, thereby improving the position stability of the connecting portion 220, thereby ensuring the working performance of the connecting portion 220.

[0112] It should also be noted that the present application configures the pole assembly 200 to include a connecting portion 220 and a fixing cylinder 230, so that the pole assembly 200 can be composed of two separate parts. In this way, during the processing of the pole assembly 200, the connecting portion 220 and the fixing cylinder 230 can be processed separately to reduce the manufacturing difficulty of the pole assembly 200 and make the pole assembly 200 easy to manufacture. At the same time, different materials and shapes can be selected according to the different functions of the connecting portion 220 and the fixing cylinder 230, thereby reducing the process difficulty and material cost of the pole assembly 200 and achieving the purpose of saving manufacturing costs.

[0113] In some embodiments, since at least a portion of the current collecting plate 600 of the present application is located in the extension space 210 and is electrically connected to the pole assembly 200, the fixing tube 230 has no overcurrent requirement. Therefore, the fixing tube 230 can be made of stainless steel material with low cost, higher structural strength and better rust resistance to replace the high-cost copper and aluminum materials in the prior art, thereby reducing the manufacturing cost of the fixing tube 230.

[0114] At the same time, since at least a portion of the collecting plate 600 of the present application is located in the extending space 210 to realize electrical connection with the pole assembly 200, the shape of the fixing cylinder 230 can also be made simple. Therefore, the fixing cylinder 230 can be produced by stamping and drawing with lower manufacturing cost, so as to further reduce the manufacturing cost of the fixing cylinder 230.

[0115] In summary, the present application configures the pole assembly 200 to include a connecting portion 220 and a fixing cylinder 230 so that the pole assembly 200 is composed of two separate parts, so as to facilitate adaptive adjustment of the material and manufacturing process of the fixing cylinder 230, thereby reducing the manufacturing cost of the pole assembly 200.

[0116] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the connection part 220 includes a connection ring 221 and a connection plate 222, the connection ring 221 is sleeved on the outer periphery of the fixing cylinder 230, the connection plate 222 is fixed to the side of the connection ring 221 away from the cover plate 100 to cover the connection ring 221, and at least part of the current collecting plate 600 is located in the fixing cylinder 230 and is electrically connected to the connection plate 222. Thus, the current collecting plate 600 is electrically connected to the connection part 220, that is, the current collecting plate 600 is electrically connected to the pole assembly 200, and the difficulty of electrical connection between the current collecting plate 600 and the pole assembly 200 is reduced.

[0117] At the same time, the above arrangement can also realize splitting the connection part 220 into two separate parts, so as to reduce the manufacturing difficulty of the connection part 220 and facilitate the manufacturing of the connection part 220.

[0118] In some embodiments, the connection plate 222 is formed of copper or aluminum with better conductivity to ensure the conductivity of the connection plate 222 , thereby facilitating the electrical connection between the pole assembly 200 and external structural components using the connection plate 222 .

[0119] In summary, the present application configures the pole assembly 200 to be composed of three parts (connecting ring 221, connecting plate 222 and fixing tube 230) so that the pole assembly 200 is easy to manufacture, and at the same time, different materials and shapes can be selected for the three parts according to the different functions of the structure, thereby reducing the process difficulty and material cost of the pole assembly 200.

[0120] In some embodiments, two step surfaces are provided on the inner wall of the connecting ring 221, the end of the fixing tube 230 facing away from the accommodating cavity is connected to one of the step surfaces on the connecting ring 221, and the connecting plate 222 is connected to the other step surface of the connecting ring 221, thereby realizing the matching connection between the connecting ring 221, the connecting plate 222 and the fixing tube 230, ensuring the connection quality of the connecting ring 221, the connecting plate 222 and the fixing tube 230, thereby ensuring the structural stability of the pole assembly 200, which is beneficial to improving the working performance of the pole assembly 200.

[0121] Optionally, the end of the fixing tube 230 facing away from the accommodating cavity is riveted to one of the step surfaces on the connecting ring 221 to ensure the connection quality between the fixing tube 230 and the connecting ring 221 .

[0122] In a specific example, when assembling the pole assembly 200, the end of the fixing tube 230 facing away from the accommodating cavity can be first riveted to the connecting ring 221. After the riveting is completed, the connecting plate 222 is installed on another step surface of the connecting ring 221, and then the connecting plate 222 and the connecting ring 221 are welded to ensure the sealing function of the cover plate 100.

[0123] In summary, when the pole assembly 200 and the current collecting plate 600 need to be connected, the position of the connecting protrusion 620 of the current collecting plate 600 can be first identified by a CCD (Charge Coupled Device) camera, and then the angle of the cover plate 100 can be corrected to make the protruding space 210 of the pole assembly 200 correspond to the connecting protrusion 620 of the current collecting plate 600 and ensure that at least a portion of the connecting protrusion 620 can fit into the protruding space 210, and then the current collecting plate 600 and the cover plate 100 are relatively moved to make the connecting plate 222 of the pole assembly 200 fit tightly with the first part 621 of the connecting protrusion 620, and finally the pole assembly 200 and the current collecting plate 600 are fusion-welded by laser penetration welding from the outside of the cover plate 100 to ensure that the current collecting plate 600 and the pole assembly 200 can be effectively connected to achieve current flow, thereby achieving current conduction of the pole core to ensure the working performance of the battery cell 1000.

[0124] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the battery cell 1000 also includes an insulating seal 500, which is arranged between the cover plate 100 and the pole assembly 200 to insulate and connect the cover plate 100 and the pole assembly 200. The outer peripheral wall of the fixing cylinder 230 is provided with a limiting groove, and at least a part of the connecting ring 221 and the insulating seal 500 are arranged in the limiting groove. In this way, during the assembly process of the connecting ring 221 and the fixing cylinder 230, the connecting ring 221 and the fixing cylinder 230 can be used to cooperate with each other to squeeze the insulating seal 500, so as to ensure the insulating sealing effect of the insulating seal 500, so that the pole assembly 200 and the cover plate 100 can form an insulating sealing match, so as to avoid the pole assembly 200 and the cover plate 100 from forming an electrical connection to a certain extent, and ensure the working performance of the battery cell 1000.

[0125] In some embodiments, Figure 5 As shown, the opposite ends of the fixed cylinder 230 are folded in a direction away from the radial center of the fixed cylinder 230 to form a limiting groove on the outer peripheral wall of the fixed cylinder 230, so that at least a portion of the connecting ring 221 and the insulating seal 500 can be arranged in the limiting groove to ensure the insulating sealing effect of the insulating seal 500.

[0126] In a specific example, after the insulating seal 500, the connecting ring 221 and the fixing tube 230 are assembled, the opposite ends of the fixing tube 230 can be folded to ensure that at least a portion of the connecting ring 221 and the insulating seal 500 are both disposed in the limiting groove, thereby reducing the difficulty of assembling the insulating seal 500, the connecting ring 221 and the fixing tube 230.

[0127] 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 plate 100, so as to realize that the insulating seal 500 is arranged between the pole assembly 200 and the cover plate 100, thereby realizing the insulating sealing cooperation between the cover plate 100 and the pole assembly 200, and reducing the difficulty of installing the insulating seal 500 and the cover plate 100.

[0128] 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 plate 100, and the sealing member 520 is arranged on the inner side of the cover plate 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 plate 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 1000 from overflowing, so as to ensure the working performance of the battery cell 1000.

[0129] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the insulating member 510 includes an insulating portion 511 and a sealing portion 512. The sealing portion 512 is arranged opposite to the sealing member 520. The insulating portion 511 is arranged on the outer periphery of the sealing portion 512, so that the insulating member 510 has an insulating sealing effect. In this way, while ensuring the insulating coordination between the cover plate 100 and the pole assembly 200, it can further avoid the overflow of the electrolyte in the battery cell 1000 to ensure the working performance of the battery cell 1000.

[0130] In some embodiments, in combination Figure 2 , Figure 3 and Figure 4As shown, the battery cell 1000 further includes an explosion-proof valve 300, which is arranged on the cover plate 100. On the same projection plane, the orthographic outer contour of the pole assembly 200 deviates from the center of the orthographic outer contour of the cover plate 100, and the side of the orthographic outer contour of the pole assembly 200 close to the center of the orthographic outer contour of the cover plate 100 is the first side, and the orthographic projection of the explosion-proof valve 300 is arranged close to the first side, wherein the projection plane is perpendicular to the thickness direction of the cover plate 100. It should be noted that 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, the explosion-proof valve 300 and the cover plate 100 on the projection plane can also be understood as the orthographic projection of the pole assembly 200, the explosion-proof valve 300 and the cover plate 100 on a plane parallel to the cover plate 100. Figure 2 The cover plate 100 shown in FIG. 1 is the plane of the cover plate 100 .

[0131] That is to say, the orthographic outer contour of the pole assembly 200 on a plane parallel to the cover plate 100 is set away from the center of the orthographic outer contour of the cover plate 100 on a plane parallel to the cover plate 100, and the orthographic projection of the explosion-proof valve 300 on a plane parallel to the cover plate 100 is located on the side of the orthographic projection of the pole assembly 200 close to the center of the orthographic outer contour of the cover plate 100.

[0132] The above can also be understood as, in the radial direction of the cover plate 100, the pole assembly 200 is arranged away from the radial center of the cover plate 100, the explosion-proof valve 300 and the pole assembly 200 are arranged in sequence in the radial direction of the cover plate 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 plate 100.

[0133] It should be noted that the deviation of the orthographic outer contour of the pole assembly 200 from the center of the orthographic outer contour of the cover plate 100 can be understood as the center of the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover plate 100 are spaced apart on the projection plane; the radial direction of the cover plate 100 is perpendicular to the axial direction of the cover plate 100, and the axial direction of the cover plate 100 can be understood as Figure 3 The Z direction shown in .

[0134] In addition, when the shape of the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover plate 100 is formed into a circular shape, the center is the center of the circle of the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover plate 100; when the shape of the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover plate 100 is formed into a square shape, the center is the intersection of the diagonals of the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover plate 100; when the shape of the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover plate 100 is formed into a triangular shape, the center is the intersection of the three medians of the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the cover plate 100.

[0135] It should be noted that when a battery cell 1000, especially a sodium-based battery cell 1000 or a large-capacity battery cell 1000, is internally short-circuited, the electrolyte will quickly vaporize under the high temperature of the short circuit, generating a large amount of gas. If the gas cannot be discharged in time, there is a safety problem of explosion of the battery cell 1000.

[0136] Therefore, the present application sets an explosion-proof valve 300 on the cover plate 100 to ensure that when the internal pressure of the battery cell 1000 is relatively high, the pressure can be discharged smoothly to ensure the safety of the battery cell 1000.

[0137] Through the above arrangement, the pole assembly 200 can give up the central area of ​​the cover plate 100 in the radial direction, so that in the radial direction of the cover plate 100, there is enough space for the cover plate 100 to be located on one side of the pole assembly 200. In this way, when the explosion-proof valve 300 is arranged on the side of the pole assembly 200 close to the center of the cover plate 100 in the radial direction of the cover plate 100, it can be ensured that there is enough space on the cover plate 100 to set the explosion-proof valve 300, so as to facilitate the arrangement of a large-sized explosion-proof valve 300 on the cover plate 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 1000.

[0138] That is to say, the focus of the present application is on the structural design of the cover plate 100. While ensuring that the pole assembly 200 and the explosion-proof valve 300 can both be arranged on the cover plate 100, it is preferred to design the explosion-proof valve 300 that affects the safety performance of the battery cell 1000, enhance the pressure relief capacity of the explosion-proof valve 300, and thereby ensure the working performance of the battery cell 1000 to a certain extent.

[0139] In summary, the present application provides a battery cell 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 have an extension space 210 and to design the pole assembly 200 to be offset relative to the radial center of the cover plate 100, thereby freeing up the radial center area of ​​the cover plate 100, which is conducive to designing a large-sized explosion-proof valve 300 on the cover plate 100, replacing the existing sodium-based material system or large-capacity battery with a bidirectional double explosion-proof valve structure, simplifying the structure of the cover plate 100, achieving directional and effective explosion protection, and improving the safety performance of the battery cell 1000.

[0140] It should be noted that Figure 3 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.

[0141] In some embodiments, in combination Figure 3 and Figure 4 As shown, the explosion-proof valve 300 includes an explosion-proof valve body 320 and a protective sheet 400, and the cover plate 100 includes a first surface 130 and a second surface 140, the first surface 130 and the second surface 140 are arranged opposite to each other along the thickness direction of the cover plate 100, and the cover plate 100 is provided with a through hole 110 penetrating the first surface 130 and the second surface 140, the explosion-proof valve body 320 covers the opening of the through hole 110 toward the first surface 130, and the protective sheet 400 covers the opening of the through hole 110 toward the second surface 140. The thickness direction of the cover plate 100 mentioned here can be understood as Figure 3 The Z direction shown in FIG. 1 is the axial direction of the cover plate 100 .

[0142] That is to say, the cover plate 100 includes a first surface 130 and a second surface 140 which are arranged opposite to each other in the axial direction of the cover plate 100. The cover plate 100 is also provided with a through hole 110 which penetrates the first surface 130 and the second surface 140, so that the through hole 110 penetrates the cover plate 100 in the axial direction of the cover plate 100. After the through hole 110 is formed, the through hole 110 has an opening facing the first surface 130 and an opening facing the second surface 140. By covering the opening of the through hole 110 facing the first surface 130 with the explosion-proof valve body 320 and covering the opening of the through hole 110 facing the second surface 140 with the protective sheet 400, it is possible to cover the through hole 110 with the explosion-proof valve 300. Not only can the explosion-proof valve 300 be used to improve the safety of the battery cell 1000, but also external foreign matter can be prevented from entering the battery cell 1000 through the through hole 110, thereby ensuring the working performance of the battery cell 1000 to a certain extent.

[0143] In some embodiments, in combination Figure 3 and Figure 4 As shown, the explosion-proof valve body 320 is arranged at the opening of the through hole 110 toward the first surface 130, so that the explosion-proof valve body 320 can be arranged on the cover plate 100, thereby facilitating the use of the cover plate 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 plate 100.

[0144] Optionally, the explosion-proof valve body 320 is connected to the opening of the through hole 110 toward the first surface 130 by laser welding and fusion. This can reduce the difficulty of matching the explosion-proof valve body 320 with the cover plate 100 while ensuring the connection strength between the explosion-proof valve body 320 and the cover plate 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.

[0145] 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.

[0146] In some embodiments, in combination Figure 3 and Figure 4 As shown, the protection sheet 400 is arranged at the opening of the through hole 110 toward the second surface 140, so that the protection sheet 400 is arranged on the cover plate 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 cell 1000, so as to play an explosion-proof role, and to a certain extent solve the technical problem of self-explosion of the battery cell 1000.

[0147] Optionally, the protective sheet 400 is made of rubber to ensure that the protective sheet 400 can be dissolved when exposed to heat, so as to ensure that when the explosion-proof valve body 320 exhausts 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 1000.

[0148] In some embodiments, in combination Figure 2 and Figure 3 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 1000 is relatively high, the explosion-proof valve body 320 can be effectively ruptured, so that the gas in the battery cell 1000 can be discharged through the explosion-proof valve 300, so as to achieve the effect of pressure relief and explosion prevention, and ensure the working performance of the explosion-proof valve 300.

[0149] 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 .

[0150] The shape of the thinned area 310 may be any geometric shape such as a circle, annular or geometric cross.

[0151] It should be noted that the thickness of the thinned area 310 mentioned above can be understood as the thickness of part of the structure on the explosion-proof valve body 320 after being compressed and thinned. When the thickness of the thinned area 310 is thin, the structural strength of the explosion-proof valve body 320 will be reduced, shortening the service life of the explosion-proof valve body 320; when the thickness of the thinned area 310 is thick, when the internal pressure of the battery cell 1000 is high, it cannot be guaranteed that the explosion-proof valve body 320 can be effectively ruptured, reducing the safety of the battery cell 1000.

[0152] 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 1000 is relatively high, the explosion-proof valve body 320 can be effectively ruptured, thereby facilitating the discharge of gas in the battery cell 1000 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 1000.

[0153] 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.

[0154] 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 1000 .

[0155] In some embodiments, the protective sheet 400 is bonded and fixed to the second surface 140. In this way, the protective sheet 400 is fixedly connected to the cover plate 100, and the connection between the protective sheet 400 and the cover plate 100 can be dissolved by heat during thermal runaway exhaust, which facilitates gas exhaust and further ensures the safety of the battery cell 1000.

[0156] In some embodiments, the thickness of the protective sheet 400 ranges from 0.2 mm to 0.7 mm. Figure 4 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.

[0157] 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.

[0158] 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.

[0159] In some embodiments, on the projection plane, the minimum distance between the orthographic outer contour of the explosion-proof valve 300 and the center of the orthographic outer contour of the cover plate 100 is a first spacing, and the minimum distance between the orthographic outer contour of the pole assembly 200 and the center of the orthographic outer contour of the cover plate 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 plate 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 plate 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 plate 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 plate 100, so that relative to the pole assembly 200, in the radial direction of the cover plate 100, the explosion-proof valve 300 can be arranged closer to the radial center of the cover plate 100, thereby facilitating the arrangement of a large-sized explosion-proof valve 300 on the cover plate 100, so as to improve the pressure relief capacity of the explosion-proof valve 300, thereby improving the safety of the battery cell 1000.

[0160] 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 plate 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 plate 100, and 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 plate 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 plate 100.

[0161] 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 plate 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 plate 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 plate 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 plate 100.

[0162] In some embodiments, in combination Figure 1 , Figure 2 and Figure 4 As shown, on the projection surface, the orthographic projection of the explosion-proof valve 300 covers the center of the orthographic projection outer contour of the cover plate 100. It can also be understood here that on the projection surface, the center of the orthographic projection outer contour of the cover plate 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 circle of the cover plate 100 in the radial direction of the cover plate 100, which is conducive to using the space on the cover plate 100 to arrange a large-sized explosion-proof valve 300, thereby improving the pressure relief capacity of the explosion-proof valve 300.

[0163] In some embodiments, in combination Figure 1 , Figure 2 and Figure 4 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 outer contour of the orthographic projection of the cover plate 100. This can avoid the radial center of the explosion-proof valve 300 being arranged opposite to the radial center of the cover plate 100 in the axial direction of the cover plate 100, so that the explosion-proof valve 300 can be offset relative to the radial center of the cover plate 100, which is convenient for providing space for the arrangement of the pole assembly 200, so that the pole assembly 200 can be effectively arranged on the cover plate 100, reducing the difficulty of fixing the pole assembly 200.

[0164] That is to say, in the radial direction of the cover plate 100, the explosion-proof valve 300 and the pole assembly 200 on the cover plate 100 of the present application are both set away from the radial center of the cover plate 100 to achieve rational utilization of the space on the cover plate 100. In this way, while ensuring that the explosion-proof valve 300 and the pole assembly 200 can both be arranged on the cover plate 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 use of the battery cell 1000.

[0165] 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.

[0166] 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, thereby improving the safety of the battery cell 1000; at the same time, there is enough space on the cover plate 100 to arrange the pole assembly 200, ensuring the size and installation of the pole assembly 200.

[0167] 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 plate 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.

[0168] 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.

[0169] It should be noted that the maximum radial distance of the explosion-proof valve 300 can be understood as Figure 1 L2 shown in .

[0170] 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 .

[0171] 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 1000, the diameter of the pole core, the capacity of the battery cell 1000 or the electrolyte weight of the battery cell 1000, and is not limited to being set to the above-mentioned 6mm to 30mm.

[0172] 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 100 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 100 is 20%~80% of the orthographic projection area of ​​the cover plate 100 on the plane parallel to the cover plate 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 1000 to a certain extent. On the other hand, it ensures that the explosion-proof valve 300 occupies a suitable area on the cover plate 100, which is convenient for designing the size and installation of the pole assembly 200.

[0173] 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 plate 100 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 ensure that the explosion-proof valve 300 occupies a suitable space on the cover plate 100, which is conducive to ensuring the size of the pole assembly 200.

[0174] 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 plate 100 is square centimeters, the unit of the orthographic projection area S of the cover plate 100 in the direction perpendicular to the thickness of the cover plate 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 plate 100 is square meters, the unit of the orthographic projection area S of the cover plate 100 in the direction perpendicular to the thickness of the cover plate 100 is also square meters.

[0175] In some embodiments, the battery cell 1000 is formed as a cylindrical battery, and on the projection plane, the orthographic projection of the explosion-proof valve 300 is close to the center of the outer contour of the orthographic projection of the cover plate 100, and in the thickness direction of the cover plate 100, the explosion-proof valve 300 is arranged opposite to at least part of the central hole of the pole core. Here, it means that in the thickness direction of the cover plate 100, not the entire structure of the central hole is facing the explosion-proof valve 300, but part of the structure of the central hole is facing the explosion-proof valve 300, so that the explosion-proof valve 300 can be offset relative to the center of the cover plate 100, and while avoiding the explosion-proof valve 300 from occupying too much space on the cover plate 100, a certain distance can be set between the pole assembly 200 and the explosion-proof valve 300.

[0176] It should be noted that, since the center hole of the pole core has a certain size, after the battery cell 1000 is filled with electrolyte, part of the electrolyte will remain in the center hole of the pole core. By setting the explosion-proof valve 300 to be directly opposite to at least part of the center hole, it can be ensured that the gas in the center hole can be quickly discharged, thereby improving the safety of the battery cell 1000.

[0177] In some embodiments, the orthographic projection of the explosion-proof valve 300 covers the center of the orthographic projection outer contour of the cover plate 100, and at least part of the explosion-proof valve 300 is arranged opposite to the center hole. Here, it means that the orthographic projection of the explosion-proof valve 300 covers the center of the orthographic projection outer contour of the cover plate 100, so that at least part of the explosion-proof valve 300 is arranged opposite to the center hole of the pole core. Compared with setting the explosion-proof valve 300 to be arranged opposite to part of the center hole, it can ensure that a large amount of gas in the center hole can be quickly discharged, so that the gas in the battery cell 1000 can be quickly discharged, thereby improving the safety of the battery cell 1000.

[0178] Of course, in some other embodiments, when the orthographic projection of the explosion-proof valve 300 covers the center of the outer contour of the orthographic projection of the cover plate 100, the explosion-proof valve 300 can also be set to face at least a portion of the center hole to avoid the explosion-proof valve 300 occupying too much space on the cover plate 100, while also allowing a certain distance between the pole assembly 200 and the explosion-proof valve 300 to ensure the working performance of the battery cell 1000.

[0179] Optionally, combined Figure 3 , Figure 4 and Figure 6 As shown, the collecting plate 600 is provided with a second connecting hole 611 facing the center hole to realize the connection between the center hole and the explosion-proof valve 300, which can avoid the collecting plate 600 from hindering the discharge of the gas in the center hole to a certain extent, thereby ensuring that a large amount of gas in the center hole can be effectively and quickly discharged through the explosion-proof valve 300, thereby improving the safety of the battery cell 1000.

[0180] In some embodiments, on the projection plane, the orthographic outer contour of the explosion-proof valve 300 is spaced from the orthographic outer contour of the pole assembly 200, and the value range of the minimum spacing is 5mm to 15mm. Here, it means that on the plane parallel to the cover plate 100, there are multiple distances between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the explosion-proof valve 300, and the value range of the closest distance is 5mm to 15mm.

[0181] 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 2 As shown in the figure, when L3 is designed to be of appropriate size, it is convenient to assemble the pole assembly 200 and the explosion-proof valve 300, further improve the working performance of the pole assembly 200 and the explosion-proof valve 300, and is conducive to setting a large-sized explosion-proof valve 300. On the other hand, it is also convenient to set a suitable distance between the pole assembly 200 and the outer edge of the cover plate 100 to ensure the structural strength of the cover plate 100.

[0182] Therefore, the present application sets the value range of the minimum spacing L3 between the orthographic outer contour of the pole assembly 200 and the orthographic outer contour of the explosion-proof valve 300 on the projection plane to 5mm to 15mm. In this way, while ensuring the structural strength of the cover plate 100, it can also avoid the pole assembly 200 and the explosion-proof valve 300 from influencing 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 the battery cell 1000.

[0183] 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.

[0184] In some embodiments, in combination Figure 2 and Figure 3 As shown, on the projection surface, the orthographic outer contour of the explosion-proof valve 300 and the orthographic outer contour of the pole assembly 200 are spaced from the orthographic outer contour of the cover plate 100. Since the pole assembly 200 is disposed on the cover plate 100 through the first connecting hole 120, and the explosion-proof valve 300 is disposed on the cover plate 100 through the through hole 110, through the above arrangement, the first connecting hole 120, the through hole 110 and the outer edge of the cover plate 100 can be spaced, thereby avoiding damage to the cover plate 100 in the process of opening the first connecting hole 120 and the through hole 110 to a certain extent, extending the service life of the cover plate 100, and at the same time improving the structural strength of the cover plate 100.

[0185] 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 plate 100 is in the range of 3 mm to 10 mm. It can also be understood here that on a plane parallel to the cover plate 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 plate 100, and the value range of the closest distance is 3 mm to 10 mm. It can also be understood that on a plane parallel to the cover plate 100, the minimum distance between the orthographic projection outer contour of the through hole 110 and the orthographic projection outer contour of the cover plate 100 is in the range of 3 mm to 10 mm.

[0186] 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 plate 100 on the projection surface mentioned above can be understood as Figure 2 As shown in the figure, when L1 is kept in a suitable range, the structural strength of the cover plate 100 is ensured, and the explosion-proof valve 300 occupies a suitable space on the cover plate 100. There is enough space on the cover plate 100 to arrange the pole assembly 200, thereby ensuring the size and installation of the pole assembly 200.

[0187] 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 plate 100 on the projection plane to 3mm to 10mm. In this way, while ensuring the structural strength of the cover plate 100, it can also ensure that the explosion-proof valve 300 occupies a suitable space on the cover plate 100, so that there is enough space on the cover plate 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 difficulty of installing the pole assembly 200.

[0188] 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 plate 100 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc.

[0189] Optionally, 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 cover plate 100 is in the range of 3mm to 10mm. This means that on a plane parallel to the cover plate 100, there are multiple distances between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the cover plate 100, and the value range of the closest distance is 3mm to 10mm. The minimum distance between the orthographic projection outer contour of the pole assembly 200 and the orthographic projection outer contour of the cover plate 100 mentioned here can be understood as Figure 2 L4 shown in .

[0190] When L4 is designed to be of appropriate size, the distance between the first connecting hole 120 and the outer edge of the cover plate 100 will be appropriate, thereby improving the structural strength of the cover plate 100; at the same time, the pole assembly 200 will occupy an appropriate space on the cover plate 100, thereby allowing sufficient space on the cover plate 100 to arrange the explosion-proof valve 300 and other structural parts, which is conducive to setting a large-sized explosion-proof valve 300 and improving the safety of the battery cell 1000.

[0191] 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 plate 100 on the projection plane to 3mm to 10mm. In this way, while ensuring the structural strength of the cover plate 100, the pole assembly 200 can also occupy a suitable space on the cover plate 100, so that there is enough space on the cover plate 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.

[0192] 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 plate 100 is 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc.

[0193] It should be noted that, combined with Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, the outer shape of the pole assembly 200 can be any closed geometric shape such as annular, rectangular, sector-shaped, arc-shaped or circular, and the present application does not impose any specific limitation.

[0194] It should also be noted that the structure of the cover plate 100 and the structure of the current collecting plate 600 of the present application are also applicable to the top cover plate or the bottom cover plate of the steel shell cylindrical battery.

[0195] The battery pack according to an embodiment of the present invention is described below.

[0196] A battery pack according to an embodiment of the present invention includes: a plurality of battery cells 1000 .

[0197] The battery cell 1000 is the aforementioned battery cell 1000 , and the specific structure of the battery cell 1000 is not described in detail herein.

[0198] It can be seen from the above structure that the battery pack of the embodiment of the utility model can effectively reduce the manufacturing difficulty of the battery pack and ensure the working performance of the battery pack by adopting the aforementioned battery cell 1000.

[0199] In the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0200] The electrical device of the embodiment of the utility model is described below.

[0201] An electric device according to an embodiment of the present invention includes: a battery cell 1000 or a battery pack.

[0202] The battery cell 1000 is the aforementioned battery cell 1000 , and the specific structure of the battery cell 1000 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.

[0203] It can be seen from the above structure that the electric device of the embodiment of the utility model can reduce the manufacturing difficulty of the electric device and ensure the working performance of the electric device by adopting the above-mentioned battery cell 1000 or battery pack.

[0204] It should be noted that the electrical devices mentioned here may be but are not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery vehicles, electric vehicles, ships, spacecraft, etc.

[0205] 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.

[0206] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" 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; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0207] The battery cell 1000, the battery pack and other components of the electrical device according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0208] 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.

[0209] 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 battery cell, characterized in that: include: The housing comprises a shell and a cover plate, an open accommodating cavity is formed in the shell, and the cover plate is arranged at the opening; A pole assembly, the pole assembly being arranged on the cover plate, and the pole assembly being provided with a space extending toward the opening of the accommodating cavity; A pole core, the pole core being arranged in the accommodating cavity; A current collecting plate is disposed between the pole core and the cover plate and is electrically connected to the pole core. At least a portion of the current collecting plate is located in the extending space to be electrically connected to the pole assembly.

2. The battery cell according to claim 1, characterized in that: The current collecting disk includes a disk body and a connecting protrusion protruding toward the pole assembly, the disk body is connected to the pole core, the connecting protrusion is connected to the disk body and at least part of the connecting protrusion is located in the extending space, and the connecting protrusion is electrically connected to the pole assembly.

3. The battery cell according to claim 2, characterized in that: The connecting protrusion includes a first portion and a second portion, the first portion is electrically connected to the pole assembly, and the second portion is connected between the first portion and the disk body.

4. The battery cell according to claim 3, characterized in that: The second part includes a first support plate and a second support plate arranged opposite to each other in a first direction, two ends of the first part are respectively connected to the first support plate and the second support plate, and a dimension of the first part along the first direction is greater than a distance between the first support plate and the second support plate.

5. The battery cell according to claim 4, characterized in that: The first support plate and the first part are connected via at least one circular arc segment, and / or the second support plate and the first part are connected via at least one circular arc segment.

6. The battery cell according to claim 4, characterized in that: One of the first support plate and the second support plate is formed as an integral piece with the disc body, and the other is welded to the disc body.

7. The battery cell according to claim 4, characterized in that: The first support plate and the disk body are formed as an integral piece, the second support plate includes a first plate body and a second plate body connected to the first plate body at an angle, the first plate body extends toward the pole assembly, the second plate body is connected to a side of the first plate body close to the disk body and is welded to a surface of the disk body facing the cover plate.

8. The battery cell according to claim 7, characterized in that: The first support plate and the disk body are connected via at least one arc segment, and / or the first plate body of the second support plate and the second plate body of the second support plate are connected via at least one arc segment.

9. The battery cell according to claim 2, characterized in that: The connecting protrusion is formed by bending.

10. The battery cell according to claim 1, characterized in that: The pole assembly comprises: A connecting portion, the connecting portion is arranged on a side of the cover plate facing away from the accommodating cavity and is insulated and connected to the cover plate; A hollow fixed tube is passed through the cover plate and is insulated and fixed to the cover plate, the insertion space is defined in the fixed tube, the side of the fixed tube facing away from the accommodating cavity is connected to the connecting portion, and at least part of the collecting plate is located in the fixed tube and is electrically connected to the connecting portion.

11. The battery cell according to claim 10, characterized in that: The connecting portion includes a connecting ring and a connecting plate. The connecting ring is sleeved on the outer circumference of the fixing tube. The connecting plate is fixed to the side of the connecting ring away from the cover plate to cover the connecting ring. At least part of the collecting plate is located in the fixing tube and is electrically connected to the connecting plate.

12. The battery cell according to claim 11, characterized in that: It also includes an insulating seal, which is arranged between the cover plate and the pole assembly to insulate and connect the cover plate and the pole assembly. The outer peripheral wall of the fixing tube is provided with a limiting groove, and at least a part of the connecting ring and the insulating seal are arranged in the limiting groove.

13. The battery cell according to any one of claims 1 to 12, characterized in that: It also includes an explosion-proof valve, which is arranged on the cover plate. On the same projection plane, the outer contour of the orthographic projection of the pole assembly deviates from the center of the orthographic projection outer contour of the cover plate, and 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 plate is the first side, and the orthographic projection of the explosion-proof valve is arranged close to the first side, wherein the projection plane is perpendicular to the thickness direction of the cover plate.

14. The battery cell according to claim 13, characterized in that: The battery cell is formed as a cylindrical battery. On the projection plane, the orthographic projection of the explosion-proof valve is close to the center of the outer contour of the orthographic projection of the cover plate, and in the thickness direction of the cover plate, the explosion-proof valve is arranged opposite to at least part of the central hole of the pole core.

15. The battery cell according to claim 14, characterized in that: The orthographic projection of the explosion-proof valve covers the center of the outer contour of the orthographic projection of the cover plate, and at least a portion of the explosion-proof valve is arranged opposite to the central hole.

16. The battery cell according to claim 13, characterized in that: On the projection surface, the orthographic outer contour of the explosion-proof valve and the orthographic outer contour of the pole assembly are spaced apart, and the minimum spacing ranges from 5 mm to 15 mm.

17. The battery cell according to claim 13, characterized in that: On the projection surface, the minimum distance between the orthographic projection outer contour of the explosion-proof valve and the orthographic projection outer contour of the cover plate is in the range of 3 mm to 10 mm; and / or, On the projection plane, the minimum distance between the orthographic projection outer contour of the pole assembly and the orthographic projection outer contour of the cover plate is in the range of 3 mm to 10 mm.

18. A battery pack, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 17.

19. An electrical device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 17 or a battery pack according to claim 18.

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