Pole assembly of battery monomer, battery monomer, battery assembly and power utilization device

Abstract

The utility model discloses a pole assembly of battery monomer, battery monomer, battery assembly and electric device, the pole assembly of battery monomer comprises pole and sealing cover, the pole is equipped with the liquid injection channel, the sealing cover comprises the body part and connecting bulge, the body part and the pole are welded and matched to block the liquid injection channel, the connecting bulge is connected with the body part, and the connecting bulge is connected with the body part. A welding seam is formed at the joint of the body part and the pole, the connecting bulge is arranged on the first end surface, deviating from the liquid injection channel, of the body part in the thickness direction, is suitable for being connected with a busbar, and protrudes out of the body part to form a step for accommodating the welding seam; the protruding height of the connecting protrusion is larger than or equal to the maximum height, protruding out of the first end face, of the weld joint. According to the pole assembly of the battery monomer, the connection quality of the sealing cover and the busbar and the connection stability can be ensured.

Description

Technical Field

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

[0002] In the prior art, after the injection channel is injected, a sealing cover is usually provided to seal the injection channel to prevent foreign matter from entering the battery cell through the injection channel and to prevent the electrolyte inside the battery cell from overflowing from the injection channel, thereby ensuring the working performance of the battery cell.

[0003] At the same time, in order to achieve electrical connection between multiple battery cells, the sealing cover needs to be connected to the bus bar, but the welding between the existing sealing cover and the bus bar is relatively unstable, which affects the welding yield of the bus bar. 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 pole assembly, which can ensure the contact area between the sealing cover and the busbar, thereby ensuring the welding yield of the sealing cover and the busbar, and solving the technical problem of poor welding yield of the busbar in the prior art.

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

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

[0007] The fourth objective of the present utility model is to provide an electrical device having the above-mentioned battery assembly.

[0008] According to the embodiment of the utility model, the pole assembly of the battery cell includes: a pole, in which a liquid injection channel is provided; a sealing cover, the sealing cover includes a main body and a connecting protrusion, the main body is welded to the pole to seal the liquid injection channel, a weld is formed at the connection between the main body and the pole, the connecting protrusion is provided on a first end face of the main body in the thickness direction away from the liquid injection channel, the connecting protrusion is suitable for connecting to a bus, the connecting protrusion protrudes from the main body to form a step to accommodate the weld, so that the protruding height of the connecting protrusion is greater than or equal to the maximum height of the weld protruding from the first end face.

[0009] According to the pole assembly of the battery cell in the embodiment of the utility model, a connecting protrusion is arranged on the first end face of the main body of the sealing cover in the thickness direction away from the injection channel, and the connecting protrusion is arranged to protrude from the main body to realize the formation of a step on the sealing cover to accommodate the weld. Since the weld is accommodated in the step, the protruding height of the connecting protrusion can be greater than or equal to the maximum height of the weld protruding from the first end face, which to a certain extent avoids the weld formed at the connection between the main body and the pole from affecting the connection between the connecting protrusion and the bus, thereby facilitating the use of the connecting protrusion to realize the electrical connection between the sealing cover and the bus, ensuring the connection quality between the sealing cover and the bus and improving the stability of the connection, thereby improving the welding yield of the bus.

[0010] In some embodiments, in the thickness direction of the main body, the connecting protrusion protrudes in a direction away from the injection channel and protrudes from the pole.

[0011] In some embodiments, the main body portion is provided with a second end face in the thickness direction facing the injection channel, the second end face and the orthographic projection of the connecting protrusion in the thickness direction of the sealing cover at least partially overlap, and the second end face is provided with a thinning groove at least partially arranged opposite to the connecting protrusion.

[0012] In some embodiments, the groove depth of the thinning groove is greater than or equal to the protrusion height of the connecting protrusion.

[0013] In some embodiments, the thinning groove is spaced apart from the outer peripheral wall of the main body, and the minimum spacing ranges from 0.8 mm to 3.6 mm.

[0014] In some embodiments, the main body includes a connected sealing portion and an overlapping portion, the sealing portion is located in the injection channel, the overlapping portion is arranged on at least a portion of the outer periphery of the sealing portion, and the overlapping portion is placed on the end face of the pole and is welded to the pole.

[0015] In some embodiments, in the thickness direction of the sealing cover, a portion of the orthographic projection of the connecting protrusion coincides with the orthographic projection of the overlapping portion.

[0016] In some embodiments, the thickness of the overlapping portion ranges from 0.3 mm to 1 mm.

[0017] In some embodiments, the thickness of the blocking portion is greater than the protrusion height of the connecting protrusion.

[0018] In some embodiments, the inner wall of the injection channel is provided with a groove, the groove extends to the end face of the pole, the bottom wall of the groove defines a support surface, the main body is supported on the support surface and the outer peripheral wall of the main body and the inner peripheral wall of the groove are welded together.

[0019] In some embodiments, the first end surface protrudes from the end surface of the pole.

[0020] In some embodiments, the distance between the first end face and the end face of the pole is in the range of 0.05 mm to 1 mm.

[0021] In some embodiments, a first chamfer is provided between the groove and the end face of the pole, a second chamfer is provided between the outer peripheral wall of the main body and the first end face, the first chamfer and the second chamfer are spaced apart, and solder is provided between the first chamfer and the second chamfer.

[0022] In some embodiments, the inner circumferential wall of the groove extends obliquely relative to the support surface in a direction away from the center of the injection channel, and the outer circumferential wall of the main body and the inner circumferential wall of the groove are matched.

[0023] In some embodiments, the angle between the inner circumferential wall of the groove and the supporting surface is a, wherein 90°<a≤150°.

[0024] In some embodiments, the pole includes a bottom plate and a side plate, the side plate is connected to one side of the bottom plate in the thickness direction and extends along the circumference of the bottom plate to define the injection channel, the bottom plate is provided with an injection hole connected to the injection channel, the injection hole is provided with a sealing member for sealing it, and the bottom plate is suitable for being electrically connected to the pole core.

[0025] The battery cell according to the embodiment of the utility model includes: a shell, the shell forms a accommodating cavity; a pole core, the pole core is arranged in the accommodating cavity and has a pole ear; a pole assembly, the pole assembly is the aforementioned pole assembly, the pole assembly is insulated and connected to the shell, and the pole ear is electrically connected to the pole assembly.

[0026] According to the battery cell of the embodiment of the utility model, the aforementioned pole assembly is adopted to ensure the connection quality between the sealing cover and the bus bar, thereby improving the working performance of the battery cell.

[0027] The battery assembly according to the embodiment of the present invention is characterized by comprising a plurality of the aforementioned battery cells.

[0028] According to the battery assembly of the embodiment of the utility model, by adopting the aforementioned battery cells, the connection quality between the plurality of battery cells can be ensured, thereby ensuring the working performance of the battery assembly.

[0029] The electrical device according to the embodiment of the utility model is characterized in that it includes the aforementioned battery assembly.

[0030] According to the electric device of the embodiment of the utility model, the working performance of the electric device is improved by adopting the aforementioned battery assembly.

[0031] 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

[0032] 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:

[0033] Figure 1 It is a partial cross-sectional view of the battery cells and bus bars of some embodiments of the first aspect of the utility model when they are connected.

[0034] Figure 2 It is a partial cross-sectional view of a battery cell of some embodiments of the second aspect of the utility model.

[0035] Figure 3 for Figure 2 A partial enlarged view of area Ⅰ in the middle.

[0036] Figure 4 Schematic diagram of the sealing cover of some embodiments of the second aspect of the utility model.

[0037] Figure 5 It is a cross-sectional view of the sealing cover of some embodiments of the second aspect of the utility model.

[0038] Figure 6 Schematic diagram of poles according to some embodiments of the present invention.

[0039] Figure 7 Partial cross-sectional views of battery cells of some embodiments of the first aspect of the utility model.

[0040] Figure 8 sectional views of the sealing covers of some embodiments of the first aspect of the utility model.

[0041] Fig. 9 Schematic diagram of sealing covers of some embodiments of the third aspect of the utility model.

[0042] Fig.10 It is a cross-sectional view of the sealing cover of some embodiments of the third aspect of the utility model.

[0043] Fig.11 It is a partial cross-sectional view of a battery cell of some embodiments of the third aspect of the utility model.

[0044] Fig.12 Schematic diagram of battery cells according to some embodiments of the present invention.

[0045] Fig.13 Exploded diagram of a battery cell according to some embodiments of the present invention.

[0046] Fig.14 Schematic diagram of current collecting plates according to some embodiments of the present invention.

[0047] Fig.15 It is a schematic diagram of the current collecting disk and the negative electrode cover plate in other embodiments of the utility model, wherein the current collecting disk is in an unfolded state.

[0048] Fig.16 Schematic diagrams of current collecting plates of other embodiments of the present invention, wherein the current collecting plates are in the folding process.

[0049] Reference numerals:

[0050] 1000, battery cell;

[0051] 100. Collecting plate;

[0052] 110. a first connecting portion;

[0053] 120, second connecting portion; 122, identification area;

[0054] 130, middle part; 140, plate body;

[0055] 200, pole assembly;

[0056] 210, cover plate;

[0057] 220, blocking parts;

[0058] 230, sealing cover;

[0059] 231. Ontology part;

[0060] 2311, first end surface;

[0061] 2312, blocking department;

[0062] 2313, overlap;

[0063] 232, connecting protrusion;

[0064] 234, second end surface; 2341, thinning groove;

[0065] 235, second chamfer;

[0066] 250, pole;

[0067] 211, liquid injection channel; 2111, groove; 2112, support surface;

[0068] 213, first chamfer;

[0069] 251, end surface; 2113, bottom plate; 2119, side plate; 2114, injection hole;

[0070] 260, negative electrode cover;

[0071] 270, top spacer;

[0072] 290, weld;

[0073] 400, insulating member; 430, insulating sheet; 440, sealing ring;

[0074] 500, buffer parts;

[0075] 800, protective film;

[0076] 300, housing;

[0077] 320, pole core;

[0078] 2000. Bus. DETAILED DESCRIPTION

[0079] 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.

[0080] 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.

[0081] The following describes the terminal assembly 200 of the battery cell 1000 according to the embodiment of the present invention with reference to the accompanying drawings.

[0082] Combination Figure 1 , Figure 2 and Figure 3 As shown, the electrode assembly 200 of the battery cell 1000 according to the embodiment of the present invention includes: an electrode 250 and a sealing cover 230 .

[0083] Among them, Figure 1 and Figure 2 As shown, a liquid injection channel 211 is provided in the pole 250. The liquid injection channel 211 is used to achieve communication between the two opposite sides of the pole 250, so as to facilitate the liquid injection through the liquid injection channel 211 toward the pole core 320 (the specific structure of the pole core 320 can be seen in Figure 1 , Figure 2 and Fig.13 ) to ensure the working performance of the pole core 320, that is, to ensure the working performance of the battery cell 1000.

[0084] Combination Figure 1-Figure 5 As shown, the sealing cover 230 includes a main body 231 and a connecting protrusion 232. The main body 231 is welded with the pole 250 to block the injection channel 211. A weld 290 is formed at the connection between the main body 231 and the pole 250. The connecting protrusion 232 is provided at a first end face 2311 of the main body 231 in the thickness direction away from the injection channel 211. The connecting protrusion 232 is suitable for connecting with the bus 2000. The connecting protrusion 232 protrudes from the main body 231 to form a step for accommodating the weld 290, so that the protrusion height of the connecting protrusion 232 is greater than or equal to the maximum height of the weld 290 protruding from the first end face 2311. Here, it means that when the main body 231 is welded with the pole 250 to block the injection channel 211, a weld 290 is formed at the connection between the main body 231 and the pole 250. At the same time, in the thickness direction of the main body 231 (the thickness direction mentioned here can also be understood as Figure 1 The main body 231 has a first end face 2311 away from the injection channel 211, and the connecting protrusion 232 is arranged on the first end face 2311 and the connecting protrusion 232 is arranged to protrude from the main body 231, so as to form a step on the sealing cover 230 to accommodate the weld 290. Since the weld 290 is accommodated in the step, the protrusion height of the connecting protrusion 232 (the protrusion height of the connecting protrusion 232 can be understood as Figure 5 H4) shown in the figure is greater than or equal to the maximum height of the weld 290 protruding from the first end face 2311, so as to avoid the weld 290 protruding from the connecting protrusion 232 in the thickness direction of the main body 231. In this way, when the connecting protrusion 232 is connected to the bus 2000, the weld 290 can be avoided from affecting the connection between the connecting protrusion 232 and the bus 2000, thereby ensuring the connection quality and stability of the sealing cover 230 and the bus 2000, and improving the welding yield of the bus 2000.

[0085] It should be noted that the protrusion height of the connecting protrusion 232 is greater than or equal to the maximum height of the weld 290 protruding from the first end face 2311, which means that in the process of connecting the main body 231 and the pole 250, a weld 290 is formed at the connection between the main body 231 and the pole 250, and the weld 290 protruding from the first end face 2311 is arranged at a step for accommodating the weld 290. In this way, in the process of connecting the connecting protrusion 232 and the bus 2000, the weld 290 can be prevented from hindering the bus 2000 from contacting the connecting protrusion 232, thereby ensuring the contact area between the connecting protrusion 232 and the bus 2000, thereby ensuring the connection quality and stability of the sealing cover 230 and the bus 2000, and improving the welding yield of the bus 2000.

[0086] That is to say, the present application sets a connecting protrusion 232 on the sealing cover 230, and uses the connecting protrusion 232 to form a step on the sealing cover 230 to accommodate the weld 290, so that the protrusion height of the connecting protrusion 232 can be greater than or equal to the maximum height of the weld 290 protruding from the first end face 2311, so as to effectively ensure the connection quality and stability of the sealing cover 230 and the bus 2000.

[0087] At the same time, by using the main body 231 to block the injection channel 211, on the one hand, external foreign matter is prevented from entering the battery cell 1000 through the injection channel 211, and on the other hand, the electrolyte in the battery cell 1000 is prevented from overflowing through the injection channel 211, thereby ensuring the working performance of the battery cell 1000.

[0088] In some embodiments, the sealing cover 230 is formed by stamping to reduce the difficulty of forming the sealing cover 230 .

[0089] In some embodiments, the sealing cover 230 and the pole 250 are sealed by laser welding, so as to achieve the purpose of blocking the injection channel 211 with the sealing cover 230 .

[0090] It can be seen from the above structure that the pole assembly 200 of the battery cell 1000 of the embodiment of the utility model is configured to have a sealing cover 230 including a main body 231 and a connecting protrusion 232, and the connecting protrusion 232 is arranged on the first end surface 2311 of the main body 231 in the thickness direction away from the injection channel 211, so as to facilitate the use of the connecting protrusion 232 to realize the electrical connection between the sealing cover 230 and the bus 2000, and ensure the contact area between the sealing cover 230 and the bus 2000, thereby ensuring the connection quality and stability of the sealing cover 230 and the bus 2000, and improving the welding yield of the bus 2000.

[0091] It can be understood that compared with the prior art, the present application creatively sets the structure of the sealing cover 230 to ensure the contact area between the sealing cover 230 and the bus 2000, thereby ensuring the connection quality and stability between the sealing cover 230 and the bus 2000, and improving the welding yield of the bus 2000.

[0092] In some embodiments, the protrusion height of the connecting protrusion 232 is greater than or equal to the welding height between the sealing cover 230 and the pole 250 . Among them, the welding excess height refers to the maximum height of the weld 290 protruding from the main body 231 and the pole 250 after the sealing cover 230 and the pole 250 are welded. By setting the protrusion height of the connecting protrusion 232 to be greater than or equal to the welding excess height of the sealing cover 230 and the pole 250, it is possible to use the connecting protrusion 232 to form a step on the sealing cover 230 to accommodate the weld 290, so that the weld 290 can be accommodated in the step, so that the protrusion height of the connecting protrusion 232 can be greater than or equal to the maximum height of the weld 290 protruding from the first end face 2311, so as to avoid the weld 290 protruding from the connecting protrusion 232, thereby avoiding the weld 290 between the sealing cover 230 and the pole 250 affecting the connection between the connecting protrusion 232 and the bus 2000, further ensuring the connection quality of the connecting protrusion 232 and the bus 2000, and improving the welding yield of the bus 2000.

[0093] Therefore, the above can also be understood as that the present application, by providing a connecting protrusion 232 on the sealing cover 230 and setting the protrusion height of the connecting protrusion 232 to be greater than or equal to the welding excess height between the sealing cover 230 and the pole 250, can avoid the welding excess height generated when the sealing cover 230 and the pole 250 are welded to affect the welding of the bus 2000 and the sealing cover 230, thereby solving the technical problem in the prior art that the welding excess height between the sealing cover 230 and the pole 250 affects the welding yield of the bus 2000 and the sealing cover 230, thereby improving the welding yield of the bus 2000, which is beneficial to ensuring the welding effect between the battery cells 1000 and improving the working performance of the battery assembly.

[0094] In some embodiments, when the sealing cover 230 and the pole 250 are formed as an aluminum structure, the protrusion height H4 of the connecting protrusion 232 is ≥0.05mm; when the sealing cover 230 and the pole 250 are formed as a steel structure, the protrusion height H4 of the connecting protrusion 232 is greater than 0mm, thereby ensuring that the protrusion height of the connecting protrusion 232 can be greater than or equal to the welding excess height of the sealing cover 230 and the pole 250, thereby solving the technical problem in the prior art that the welding excess height of the sealing cover 230 and the pole 250 affects the welding yield of the bus 2000 and the sealing cover 230.

[0095] In some embodiments, Figure 6As shown, the pole 250 includes a bottom plate 2113 and a side plate 2119. The side plate 2119 is connected to one side of the bottom plate 2113 in the thickness direction and extends along the circumference of the bottom plate 2113 to define an injection channel 211. The bottom plate 2113 is provided with an injection hole 2114 connected to the injection channel 211. The injection hole 2114 is provided with a sealing member 220 for sealing it. The bottom plate 2113 is suitable for being electrically connected to the pole core 320. Among them, by setting the pole 250 to include a bottom plate 2113 and a side plate 2119, and using the bottom plate 2113 and the side plate 2119 to cooperate to define the injection channel 211, the difficulty of forming the injection channel 211 can be reduced, thereby reducing the difficulty of injecting liquid into the battery cell 1000; by providing an injection hole 2114 connected to the injection channel 211 on the bottom plate 2113, so as to facilitate the connection between the injection channel 211 and the external space, so as to facilitate the injection of liquid toward the pole core 320 through the injection channel 211, thereby ensuring the injection effect, and providing a sealing member 220 for sealing the injection hole 2114 at the injection hole 2114, thereby achieving the purpose of sealing the injection channel 211, preventing external foreign matter from entering the battery cell 1000 through the injection channel 211, and preventing the electrolyte in the battery cell 1000 from overflowing through the injection channel 211, thereby ensuring the working performance of the battery cell 1000.

[0096] At the same time, by electrically connecting the bottom plate 2113 to the pole core 320, the pole column 250 and the pole core 320 are electrically connected, so that the current of the pole core 320 can be easily drawn out by the pole column 250 to ensure the working performance of the pole core 320 and reduce the difficulty of electrical connection between the pole column 250 and the pole core 320.

[0097] It should also be noted that when the pole core 320 is formed into a cylinder, by defining the injection channel 211 in the pole 250, it is also beneficial to set the injection channel 211 directly opposite the winding hole of the pole core 320 to ensure the injection effect.

[0098] In some embodiments, the blocking member 220 is a sealing pin, which is formed by injection molding and is sealed at the injection hole 2114 of the injection channel 211 to achieve the purpose of blocking the injection channel 211 .

[0099] In some embodiments, the injection channel 211 also has a liquid inlet hole. In the thickness direction of the injection channel 211, the liquid inlet hole and the injection hole 2114 are respectively arranged on opposite sides of the injection channel 211, and after the pole assembly 200 and the pole core 320 are assembled, the injection hole 2114 is arranged close to the pole core 320, and the liquid inlet hole is arranged on the side of the injection channel 211 away from the pole core 320, so as to facilitate the injection of liquid toward the pole core 320 through the injection channel 211, thereby ensuring the working performance of the pole core 320.

[0100] Optionally, the sealing cover 230 blocks the liquid inlet hole of the liquid injection channel 211 to further achieve the purpose of blocking the liquid injection channel 211 .

[0101] In a specific example, after the injection of liquid into the injection channel 211 is completed, the injection hole 2114 of the injection channel 211 can be sealed with a sealing nail first, and then the sealing cover 230 can be laser welded to the liquid inlet hole of the injection channel 211 to achieve sealing of the injection channel 211.

[0102] At the same time, by sealing the outlet end of the injection channel 211 with a sealing nail, it is also possible to prevent welding slag from falling into the pole core 320 during the welding process of the sealing cover 230, thereby avoiding the risk of causing a short circuit in the pole core 320.

[0103] In some embodiments, the pole 250 is formed by stamping.

[0104] Optionally, the pole 250 is made of aluminum, and the aluminum is connected to the collector plate 100 (the specific structure of the collector plate 100 can be found in Fig.13 ), the collecting plate 100 is connected to the pole core 320, thereby realizing the electrical connection between the pole 250 and the pole core 320, making it easy to use the pole 250 to lead out the current of the pole core 320, thereby ensuring the working performance of the pole core 320.

[0105] In some embodiments, in combination Figure 1 , Figure 2 and Figure 3 As shown, in the thickness direction of the body portion 231, the connecting protrusion 232 protrudes in a direction away from the injection channel 211 and protrudes from the pole 250. Figure 1 and Figure 2 In the structure shown in , it can also be understood that the connecting protrusion 232 protrudes upward and protrudes from the pole 250, so that the connecting surface of the connecting protrusion 232 can be formed on the axial outside of the pole 250, so as to avoid the pole 250 affecting the connection between the connecting protrusion 232 and the bus 2000, reduce the connection difficulty between the sealing cover 230 and the bus 2000, and at the same time ensure the connection quality between the connecting protrusion 232 and the bus 2000, and improve the welding yield of the bus 2000.

[0106] In some embodiments, in combination Figure 2 , Figure 4 and Figure 5As shown, the main body 231 is provided with a second end face 234 facing the injection channel 211 in the thickness direction, the second end face 234 and the connecting protrusion 232 in the thickness direction of the sealing cover 230 are at least partially overlapped in their orthographic projections, and the second end face 234 is provided with a thinning groove 2341 at least partially arranged opposite to the connecting protrusion 232. It can also be understood here that the sealing cover 230 not only has a first end face 2311, but also has a second end face 234, and in the thickness direction of the main body 231, the first end face 2311 is arranged away from the injection channel 211, and the second end face 234 is arranged toward the injection channel 211, so that in the thickness direction of the main body 231, the first end face 2311 and the second end face 234 are arranged opposite to each other, and at the same time, in the thickness direction of the main body 231, the orthographic projections of the second end face 234 and the connecting protrusion 232 are at least partially overlapped, so that in the thickness direction of the main body 231, at least a portion of the second end face 234 is arranged opposite to the connecting protrusion 232, so that when in When the thinning groove 2341 is provided on the second end face 234, it can be ensured that at least a portion of the thinning groove 2341 is arranged opposite to the connecting protrusion 232. The above arrangement can avoid the sealing cover 230 being thicker due to the connection protrusion 232. While reducing the production cost of the sealing cover 230, the structural strength of the sealing cover 230 can also be reduced to ensure that the sealing cover 230 can be deformed under the action of an external force. In this way, during the connection process between the sealing cover 230 and the pole 250, the deformation of the sealing cover 230 can be controlled to reduce the fitting clearance between the sealing cover 230 and the pole 250, thereby improving the welding yield of the sealing cover 230 and the pole 250 and ensuring the welding quality.

[0107] That is to say, the present application sets a connecting protrusion 232 on the first end face 2311 of the sealing cover 230, sets a thinning groove 2341 on the second end face 234 of the sealing cover 230, and sets at least a portion of the thinning groove 2341 opposite to the connecting protrusion 232 in the thickness direction of the sealing cover 230, thereby absorbing the welding deformation of the sealing cover 230 and ensuring the welding quality of the sealing cover 230 and the pole 250.

[0108] 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.

[0109] In some embodiments, the groove depth of the thinning groove 2341 is greater than or equal to the protrusion height of the connecting protrusion 232. The groove depth of the thinning groove 2341 mentioned here can be understood as Figure 5H10 shown in the figure, by setting the groove depth of the thinning groove 2341 to be greater than or equal to the protrusion height of the connecting protrusion 232, the thinning effect of the thinning groove 2341 is effectively guaranteed, thereby avoiding the thickness of the sealing cover 230 being thicker due to the setting of the connecting protrusion 232, ensuring that the sealing cover 230 can be deformed under the action of external force, and facilitating the control of the deformation of the sealing cover 230 to reduce the fitting clearance between the sealing cover 230 and the pole 250.

[0110] In some embodiments, the groove depth of the thinning groove 2341 is equal to the protrusion height of the connecting protrusion 232. In this way, while ensuring the thinning effect of the thinning groove 2341, it is also possible to avoid excessive reduction of the structural strength of the sealing cover 230 due to the provision of the thinning groove 2341, that is, to ensure that the sealing cover 230 has a certain structural strength, thereby ensuring the sealing quality of the sealing cover 230.

[0111] In some embodiments, Figure 5 As shown, the thinning groove 2341 is spaced apart from the outer peripheral wall of the main body 231, and the minimum spacing ranges from 0.8mm to 3.6mm. The minimum spacing here means that there are multiple spacings between the thinning groove 2341 and the outer peripheral wall of the main body 231, and the shortest spacing between the thinning groove 2341 and the outer peripheral wall of the main body 231 is defined as the minimum spacing. The minimum spacing between the thinning groove 2341 and the outer peripheral wall of the main body 231 can be understood as Figure 5 As shown in H1, when the minimum distance between the thinning groove 2341 and the outer peripheral wall of the main body 231 is too small, the structural strength of the sealing cover 230 will be reduced, affecting the sealing effect of the sealing cover 230. At the same time, during the processing of the thinning groove 2341, the structure between the thinning groove 2341 and the outer peripheral wall of the main body 231 is easily damaged, increasing the molding difficulty of the sealing cover 230; when the minimum distance between the thinning groove 2341 and the outer peripheral wall of the main body 231 is too large, the thinning effect of the thinning groove 2341 will be reduced.

[0112] Therefore, the present application sets the minimum spacing between the thinning groove 2341 and the outer peripheral wall of the main body 231 to a range of 0.8mm-3.6mm. In this way, while ensuring the thinning effect of the thinning groove 2341, the molding difficulty of the sealing cover 230 can be reduced, while ensuring the structural strength of the sealing cover 230 and improving the sealing effect of the sealing cover 230.

[0113] In some embodiments, the minimum distance between the thinning groove 2341 and the outer peripheral wall of the main body 231 is 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm or 3.6 mm, etc.

[0114] In some embodiments, in combination Fig. 9 , Fig.10 and Fig.11As shown, the main body 231 includes a connected plugging portion 2312 and a lap portion 2313. The plugging portion 2312 is located in the injection channel 211, and the lap portion 2313 is arranged on at least part of the outer periphery of the plugging portion 2312. The lap portion 2313 is placed on the end face 251 of the pole 250 and is welded to the pole 250. The end face 251 of the pole 250 mentioned here can be understood as the end face of the pole 250 facing away from the pole core 320 in the thickness direction of the pole 250, and can also be understood as the top face of the pole 250, or the end surface of the pole 250 surrounding the liquid inlet hole of the injection channel 211. By placing the lap portion 2313 on the end face 251 of the pole 250 and welding it to the pole 250, the welding cooperation between the sealing cover 230 and the pole 250 is achieved. Since the lap portion 2313 is arranged At least part of the outer periphery of the sealing portion 2312, so that when the overlapping portion 2313 is connected to the end face 251 of the pole 250, the sealing portion 2312 can be arranged opposite to the injection channel 211, so that the sealing portion 2312 can be used to block the injection channel 211 to prevent external foreign matter from entering the battery cell 1000 through the injection channel 211, and at the same time, it can also prevent the electrolyte in the battery cell 1000 from overflowing through the injection channel 211, thereby ensuring the working performance of the battery cell 1000.

[0115] At the same time, by configuring the main body 231 to include the blocking portion 2312 and the overlapping portion 2313, when processing the pole 250, the top of the pole 250 can be formed into a single step, thereby increasing the processing feasibility of the pole 250 and reducing the processing cost.

[0116] Optionally, the overlapping portion 2313 and the pole 250 are welded by penetration welding to reduce the difficulty of assembling the sealing cover 230 and the pole 250 , thereby improving the process yield of the battery cell 1000 .

[0117] In some embodiments, in combination Fig.10 and Fig.11 As shown, in the thickness direction of the sealing portion 2312, the overlapping portion 2313 is arranged close to the end of the sealing portion 2312 away from the injection channel 211 and is connected to at least part of the outer peripheral edge of the sealing portion 2312 to achieve the connection and cooperation between the sealing portion 2312 and the overlapping portion 2313, and ensure that after the overlapping portion 2313 is connected to the end face 251 of the pole 250 in place, the sealing portion 2312 can block the injection channel 211.

[0118] In some embodiments, Fig.10As shown, in the thickness direction of the sealing cover 230, a part of the orthographic projection of the connecting protrusion 232 coincides with the orthographic projection of the overlapping portion 2313. In this way, at least a part of the connecting protrusion 232 is connected to the overlapping portion 2313. In this way, while the connecting protrusion 232 is used to connect the sealing cover 230 to the busbar 2000, the connecting protrusion 232 can also be used to improve the structural strength of the overlapping portion 2313, so that the overlapping portion 2313 can be used to weld the sealing cover 230 to the pole 250, reduce the difficulty of assembling the sealing cover 230 and the pole 250, and improve the connection quality of the sealing cover 230 and the pole 250.

[0119] In some embodiments, in the radial direction of the sealing cover 230, the outer peripheral wall of the connecting protrusion 232 and the overlapping portion 2313 are spaced apart. On the one hand, the width of the overlapping portion 2313 can be ensured, thereby ensuring the welding quality of the connecting protrusion 232 and the overlapping portion 2313. On the other hand, it can also avoid that the weld 290 is formed on the connecting protrusion 232 when the overlapping portion 2313 is welded to the pole 250, thereby avoiding that the weld 290 affects the connection between the connecting protrusion 232 and the bus 2000, which is beneficial to ensuring the connection quality and stability of the sealing cover 230 and the bus 2000, and improving the welding yield of the bus 2000.

[0120] In some embodiments, the minimum spacing between the connecting protrusion 232 and the outer peripheral wall of the overlapping portion 2313 is greater than or equal to the weld width between the overlapping portion 2313 and the pole 250 and is less than the radius of the main body 231. The minimum spacing here means that there are multiple spacings between the connecting protrusion 232 and the outer peripheral wall of the overlapping portion 2313, and the closest spacing between the connecting protrusion 232 and the outer peripheral wall of the overlapping portion 2313 is defined as the minimum spacing. The minimum spacing between the connecting protrusion 232 and the outer peripheral wall of the overlapping portion 2313 can be understood as Fig.10 H9 shown in the figure, welding molten width refers to the width of the melting area of ​​the weld 290 during the welding process of the overlap 2313 and the pole 250. Since the overlap 2313 and the pole 250 are welded by penetration welding, the above arrangement is used to ensure the welding quality of the overlap 2313 and the pole 250 and avoid the welding connection between the overlap 2313 and the pole 250. At the same time, the weld 290 is formed on the connecting protrusion 232, and the width of the connecting protrusion 232 can also be ensured, thereby ensuring the connection quality of the sealing cover 230 and the bus 2000.

[0121] In some embodiments, the thickness of the overlap portion 2313 ranges from 0.3 mm to 1 mm. Fig.10As shown in H2, when the thickness of the overlapping portion 2313 is thin, the structural strength of the overlapping portion 2313 will be reduced, affecting the working performance of the overlapping portion 2313. When the thickness of the overlapping portion 2313 is thick, the overlapping portion 2313 and the pole 250 cannot be penetrated and welded, thereby reducing the welding yield of the pole 250.

[0122] Therefore, the present application sets the thickness of the overlap portion 2313 to 0.3mm-1mm, so that while ensuring the structural strength of the overlap portion 2313, it is also convenient to achieve penetration welding between the overlap portion 2313 and the pole 250, ensuring welding efficiency, thereby ensuring the welding yield of the pole 250.

[0123] In some embodiments, the thickness of the overlapping portion 2313 is 0.3 mm, 0.5 mm, 0.8 mm, or 1 mm, etc.

[0124] In some embodiments, the thickness of the blocking portion 2312 is greater than the protrusion height of the connecting protrusion 232. The thickness of the blocking portion 2312 mentioned here can be understood as Fig.10 H8 shown in the figure, by setting the thickness of the sealing part 2312 to be greater than the protrusion height of the connecting protrusion 232, the contact area between the sealing part 2312 and the injection channel 211 can be increased, thereby ensuring the sealing effect of the sealing part 2312, and at the same time ensuring the overall height of the sealing cover 230, avoiding the sealing cover 230 to be welded through when the connecting protrusion 232 and the bus 2000 are welded. In this way, while ensuring the sealing effect of the sealing cover 230, it is also possible to avoid welding slag from flowing into the injection channel 211 when the connecting protrusion 232 and the bus 2000 are welded.

[0125] In some embodiments, the overall height H7 of the sealing cover 230 ranges from 0.8 mm to 5 mm. When the overall height of the sealing cover 230 is small, not only the sealing effect of the sealing cover 230 is reduced, but also there is a risk of welding through the sealing cover 230 when the connecting protrusion 232 is welded to the busbar 2000. When the overall height H7 of the sealing cover 230 is large, the space occupied by the sealing cover 230 is increased, the manufacturing cost of the sealing cover 230 is increased, and the difficulty of assembling the sealing cover 230 and the injection channel 211 is increased.

[0126] Therefore, the present application sets the overall height H7 of the sealing cover 230 to 0.8mm-5mm, so that while ensuring the sealing effect of the sealing cover 230, it can also avoid the connection protrusion 232 and the bus 2000 from welding through the sealing cover 230 to cause welding slag, poor appearance, etc.

[0127] In some embodiments, the overall height H7 of the sealing cover 230 is 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm, etc.

[0128] In some embodiments, in combination Figure 2-Figure 8 As shown, the inner wall of the injection channel 211 is provided with a groove 2111, and the groove 2111 extends to the end surface 251 of the pole 250 (the specific structure of the groove 2111 can be seen in Figure 3 ), the side wall of the groove 2111 defines a support surface 2112, the body 231 is supported on the support surface 2112, and the outer peripheral wall of the body 231 is welded to the inner peripheral wall of the groove 2111. It can also be understood here that it is not limited to setting the body 231 to include the blocking portion 2312 and the overlapping portion 2313 and placing the overlapping portion 2313 on the end surface 251 of the pole 250 to achieve welding cooperation between the body 231 and the pole 250, and the groove 2111 extending to the end surface 251 of the pole 250 can also be set on the inner wall of the injection channel 211.

[0129] Among them, by extending the groove 2111 to the end surface 251 of the pole 250, the groove 2111 is connected to the external space of the pole 250, so as to ensure that the main body 231 of the sealing cover 230 can be supported on the side wall of the groove 2111, so as to realize that at least a part of the sealing cover 230 is set in the groove 2111, and at the same time, the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111 are welded and connected, so that the welding cooperation between the sealing cover 230 and the pole 250 can be realized, and it is convenient to use the sealing cover 230 to block the injection channel 211, thereby preventing external foreign matter from entering the battery cell 1000 through the injection channel 211, and at the same time, it can also prevent the electrolyte in the battery cell 1000 from overflowing through the injection channel 211, thereby ensuring the working performance of the battery cell 1000.

[0130] Optionally, the outer circumferential wall of the body portion 231 and the inner circumferential wall of the groove 2111 are butt-welded to achieve a matching connection between the sealing cover 230 and the pole 250 and ensure the connection quality.

[0131] In some embodiments, Figure 3 As shown, in the radial direction of the pole 250, the outer peripheral wall of the connecting protrusion 232 is located radially inside the outer peripheral wall of the body part 231. In this way, the connecting protrusion 232 can be arranged away from the pole 250, thereby preventing the connecting protrusion 232 from affecting the butt welding of the outer peripheral wall of the body part 231 and the inner peripheral wall of the groove 2111, thereby reducing the difficulty of connecting the sealing cover 230 with the pole 250.

[0132] In some embodiments, Figure 3As shown, the connecting protrusion 232 is spaced apart from the outer peripheral wall of the main body 231. While preventing the connecting protrusion 232 from affecting the butt welding of the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111, it can also prevent the weld 290 from being formed on the connecting protrusion 232 when the main body 231 is welded to the pole 250, thereby ensuring the contact area between the connecting protrusion 232 and the bus 2000 after the sealing cover 230 is welded to the pole 250, which is beneficial to ensuring the connection quality and stability of the sealing cover 230 and the bus 2000, and improving the welding yield of the bus 2000.

[0133] In some embodiments, the minimum distance between the connecting protrusion 232 and the outer peripheral wall of the main body 231 is greater than or equal to half of the weld width between the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111 and is less than the radius of the main body 231. The minimum distance between the connecting protrusion 232 and the outer peripheral wall of the main body 231 mentioned here can be understood as Figure 8 H5 shown in the figure, the welding molten width refers to the width of the melting area of ​​the weld 290 during the welding process of the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111. Because the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111 are butt-welded, after the welding is completed, part of the welding molten width will be formed on the periphery of the connecting protrusion 232 and the surface of the pole 250. The above-mentioned arrangement can avoid the weld 290 being formed on the connecting protrusion 232 when the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111 are welded and connected, and at the same time, the width of the connecting protrusion 232 can be guaranteed, thereby ensuring the connection quality between the sealing cover 230 and the bus 2000.

[0134] In some embodiments, Figure 3 As shown, a first chamfer 213 is provided between the groove 2111 and the end surface of the pole 250, a second chamfer 235 is provided between the outer peripheral wall of the body 231 and the first end surface 2311, the first chamfer 213 and the second chamfer 235 are arranged at intervals, and solder is arranged between the first chamfer 213 and the second chamfer 235. Thus, the welding quality between the body 231 and the pole 250 is ensured, and the sealing effect of the sealing cover 230 is improved.

[0135] At the same time, the first chamfer 213 and the second chamfer 235 cooperate to guide the assembly direction of the sealing cover 230, reduce the sealing difficulty of the sealing cover 230, improve the assembly efficiency, and also reduce the molding difficulty of the sealing cover 230 and the pole 250.

[0136] It should be noted that Figure 3 2 shows that the first chamfer 213 and the second chamfer 235 are both formed as rounded corners, but in some other embodiments, the first chamfer 213 and the second chamfer 235 can also be formed as chamfered corners, which is not specifically limited here.

[0137] In some embodiments, Figure 3 As shown, the first end face 2311 protrudes from the end face 251 of the pole 250. In this way, while ensuring that the connecting protrusion 232 can protrude from the pole 250, the solder can flow between the outer peripheral wall of the body part 231 and the inner peripheral wall of the groove 2111 under the action of gravity when the outer peripheral wall of the body part 231 and the inner peripheral wall of the groove 2111 are welded, thereby ensuring the welding quality of the body part 231 and the pole 250.

[0138] In some embodiments, the distance between the first end face 2311 and the end face 251 of the pole 250 ranges from 0.05 mm to 1 mm. Figure 3 H3 shown in the figure, through the above arrangement, ensures that the first end face 2311 can protrude from the end face 251 of the pole 250, while also ensuring that the solder on the first end face 2311 can effectively flow into between the outer wall of the main body 231 and the inner wall of the groove 2111, such as: the solder flows into between the first chamfer 213 and the second chamfer 235, thereby reducing the fitting clearance between the main body 231 and the pole 250, improving the welding yield, reducing the assembly precision requirements, and improving the process feasibility.

[0139] Of course, in some other embodiments, when no chamfer is provided between the groove 2111 and the end surface of the pole 250 and between the outer peripheral wall of the body 231 and the first end surface 2311 (combined with Figure 7 and Figure 8 As shown), the first end face 2311 may also be arranged to be flush with the end face 251 of the pole 250, because when the pole 250 and the sealing cover 230 are formed as Figure 7 and Figure 8 After the structure is formed, the contact area between the outer circumferential wall of the main body 231 and the inner circumferential wall of the groove 2111 can be ensured.

[0140] In other embodiments, when the radius of the first chamfer 213 and the second chamfer 235 is less than 1 / 4 of the weld penetration, the first end face 2311 can also be set to be flush with the end face 251 of the pole 250, wherein the weld penetration refers to the depth of melting of the welded material on the cross section of the weld joint. When the radius of the first chamfer 213 and the second chamfer 235 is less than 1 / 4 of the weld penetration, the contact area between the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111 is effectively guaranteed.

[0141] In some embodiments, Figure 3As shown, the inner circumferential wall of the groove 2111 extends obliquely relative to the support surface 2112 in a direction away from the center of the injection channel 211, and the outer circumferential wall of the body 231 is matched with the inner circumferential wall of the groove 2111. By extending the inner circumferential wall of the groove 2111 obliquely relative to the support surface 2112 in a direction away from the center of the injection channel 211, the opening size of the groove 2111 can be increased, thereby reducing the difficulty of matching the outer circumferential wall of the body 231 and the inner circumferential wall of the groove 2111, ensuring that the partial structure of the body 231 can be effectively assembled into the injection channel 211.

[0142] At the same time, by matching the outer circumferential wall of the main body 231 with the inner circumferential wall of the groove 2111, the contact area between the main body 231 and the pole 250 can be increased, ensuring the welding quality between the sealing cover 230 and the pole 250, thereby achieving the purpose of sealing the injection channel 211 with the sealing cover 230.

[0143] In some embodiments, Figure 3 As shown, the angle between the inner circumferential wall of the groove 2111 and the support surface 2112 is a, wherein 90°<a≤150°. This ensures that the inner circumferential wall of the groove 2111 can effectively extend obliquely relative to the support surface 2112 in a direction away from the center of the injection channel 211, thereby improving the assembly performance of the sealing cover 230 and the groove 2111 and reducing the assembly difficulty. At the same time, the contact area between the outer circumferential wall of the body 231 and the inner circumferential wall of the groove 2111 can be ensured, thereby ensuring the welding quality of the sealing cover 230 and the pole 250.

[0144] In some embodiments, the angle between the inner wall of the groove 2111 and the support surface 2112 is 100°, 110°, 120°, 130°, 140°, or 150°, etc.

[0145] The battery cell 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0146] Combination Fig.12 and Fig.13 As shown, a battery cell 1000 according to an embodiment of the present invention includes: a housing 300 , a pole core 320 and a pole assembly 200 .

[0147] The housing 300 forms a receiving cavity, and the pole core 320 is disposed in the receiving cavity and has a pole ear, so that the pole core 320 is disposed in the housing 300, so that the housing 300 is used to protect the pole core 320, prolong the service life of the pole core 320, and improve the safety of the pole core 320.

[0148] The pole assembly 200 is the pole assembly 200 mentioned above, and the specific structure of the pole assembly 200 is not described here. The pole assembly 200 is insulated and connected to the shell 300, and the pole ear is electrically connected to the pole assembly 200. Here, it means that when the pole assembly 200 is insulated and connected to the shell 300, the pole ear of the pole core 320 is electrically connected to the pole assembly 200, thereby realizing the electrical connection between the pole core 320 and the pole assembly 200, making it easy to use the pole assembly 200 to lead out the current of the pole core 320, thereby ensuring the working performance of the battery cell 1000.

[0149] In some embodiments, the pole lug is electrically connected to the pole 250 , which can reduce the difficulty of electrical connection between the pole core 320 and the pole assembly 200 while ensuring electrical connection between the pole core 320 and the pole assembly 200 .

[0150] It can be seen from the above structure that the battery cell 1000 of the embodiment of the utility model adopts the aforementioned pole assembly 200 to ensure the connection quality between the sealing cover 230 and the bus bar 2000, thereby improving the working performance of the battery cell 1000.

[0151] In some embodiments, the housing 300 is formed by stamping or welding, and the housing 300 is made of aluminum or steel.

[0152] In some embodiments, Figure 1 , Figure 2 and Fig.12 As shown, the battery cell 1000 includes a cover plate 210 , and the pole 250 is penetrated through the cover plate 210 , so that the cover plate 210 can be used to support the pole 250 , thereby improving the position stability of the pole 250 and ensuring the working performance of the pole 250 .

[0153] In some embodiments, Figure 2 , Figure 7 and Fig.11 As shown, the battery cell 1000 further includes an insulating member 400 , which is disposed on the cover plate 210 and between the pole 250 and the cover plate 210 to insulate the cover plate 210 and the pole 250 , thereby preventing the cover plate 210 and the pole 250 from forming an electrical connection, thereby ensuring the working performance of the battery cell 1000 .

[0154] In some embodiments, Figure 2 , Figure 7 and Fig.11 As shown, the insulating member 400 includes an insulating sheet 430 and a sealing ring 440, and the insulating sheet 430 and the sealing ring 440 are arranged on opposite sides of the cover plate 210, so as to realize that the insulating member 400 is arranged between the pole 250 and the cover plate 210, thereby realizing the insulating spacing between the cover plate 210 and the pole 250, and reducing the difficulty of installing the cover plate 210 of the insulating member 400.

[0155] In some embodiments, the insulating sheet 430 is arranged on the outer side of the cover plate 210, and the sealing ring 440 is arranged on the inner side of the cover plate 210. The insulating sheet 430 is injection molded with a high-performance thermoplastic resin, such as polyphenylene sulfide, to ensure the insulation performance of the insulating sheet 430, so that the cover plate 210 and the pole 250 can effectively form an insulating interval. The sealing ring 440 is made of fluororubber, EPDM rubber or fusible polytetrafluoroethylene. In this way, while ensuring the insulation performance of the sealing ring 440, the sealing ring 440 can also have a certain sealing performance, provide a sealing function for the pole 250, and prevent the electrolyte in the battery cell 1000 from overflowing.

[0156] In some embodiments, Figure 2 , Figure 7 and Fig.11 As shown, the battery cell 1000 further includes a buffer 500, which is disposed between the insulating member 400 and the pole 250, so as to prevent the pole 250 from damaging the insulating member 400 during the molding process, extend the service life of the insulating member 400, and ensure the insulation performance of the insulating member 400.

[0157] At the same time, during the forming process of the pole 250, the buffer member 500 can also be used to limit and support the pole 250, thereby improving the structural strength of the pole 250 after forming and ensuring the position stability of the pole 250, thereby improving the position stability of the pole 250 and ensuring the performance of the pole 250.

[0158] In some embodiments, the buffer 500 is stamped from aluminum, which reduces the difficulty of molding the buffer 500 and also allows the buffer 500 to have a certain structural strength, thereby facilitating the use of the buffer 500 to limit the support of the pole 250, thereby improving the structural strength of the pole 250 after molding, and preventing the pole 250 from damaging the insulating part 400 during the molding process, thereby extending the service life of the insulating part 400.

[0159] It should be noted that the aluminum material mentioned above can be 1 series aluminum or other series aluminum, and no specific limitation is made here.

[0160] In some embodiments, the battery cell 1000 also includes an explosion-proof valve, which is provided on the cover plate 210. The explosion-proof valve is used to rupture when the internal pressure of the battery cell 1000 is high, so as to discharge the pressure in the battery cell 1000, thereby improving the safety of the battery cell 1000.

[0161] In some embodiments, Fig.12 As shown, the battery cell 1000 further includes a protection sheet 800, which is disposed outside the explosion-proof valve to protect the explosion-proof valve and prevent external foreign matter from damaging the explosion-proof valve, thereby ensuring the performance of the explosion-proof valve.

[0162] In some embodiments, Figure 2 , Figure 7 and Fig.11 As shown, the battery cell 1000 also includes a top spacer 270, which is made of polypropylene and is arranged on the other side of the cover plate 210, and a part of the structure of the top spacer 270 is located between the pole 250 and the cover plate 210, so that the top spacer 270 can be used to provide insulation function for the pole 250 and the cover plate 210. At the same time, the top spacer 270 can also be used to protect the explosion-proof valve to prevent the pole core 320 from causing damage to the explosion-proof valve, thereby ensuring the performance of the explosion-proof valve.

[0163] In some embodiments, Fig.13 As shown, the battery cell 1000 further includes a current collecting plate 100, which is disposed between the pole core 320 and the pole assembly 200 and is electrically connected to the pole tab and the pole 250, respectively. Thus, the pole tab and the pole 250 are electrically connected, reducing the difficulty of connecting the pole tab and the pole 250.

[0164] In some embodiments, the collecting plate 100 is welded to the pole lug and pole post 250 respectively. This ensures that the pole lug and pole post 250 can be electrically connected while ensuring the connection strength between the pole lug and pole post 250 and reducing the difficulty of connecting the pole lug and pole post 250, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0165] In some embodiments, the current collecting plate 100 includes a positive current collecting plate and a negative current collecting plate, the pole core 320 includes a positive pole ear and a negative pole ear, the positive current collecting plate is electrically connected to the positive pole ear of the pole core 320, and the negative current collecting plate is electrically connected to the negative pole ear of the pole core 320 to ensure the working performance of the pole core 320.

[0166] In some embodiments, in combination Fig.13 and Fig.14 As shown, the positive electrode current collecting disk includes a disk body 140, at least a portion of the disk body 140 protrudes toward the pole core 320 to form a first connection portion 110 protruding toward the pole assembly 200 and a second connection portion 120 protruding toward the pole core 320 on the disk body 140, the first connection portion 110 is electrically connected to the pole 250, and the second connection portion 120 is electrically connected to the pole ear, thereby realizing the electrical connection between the pole 250 and the pole core 320, reducing the difficulty of connecting the pole 250 and the pole core 320, and ensuring the connection quality between the pole 250 and the pole core 320.

[0167] In some embodiments, the positive current collector disc is formed by stamping to form a first connection portion 110 protruding toward the pole assembly 200 and a second connection portion 120 protruding toward the pole core 320 on the positive current collector disc, thereby reducing the difficulty of forming the positive current collector disc.

[0168] At the same time, by configuring the positive electrode current collecting disk to include a disk body 140, the positive electrode current collecting disk can also be formed into a single-layer structure, thereby reducing the space occupied by the positive electrode current collecting disk, improving the space utilization of the battery cell 1000, shortening the flow path of the current, reducing impedance and heat generation, ensuring the working performance of the battery cell 1000, and improving the safety of the battery cell 1000.

[0169] In some embodiments, the thickness of the first connection portion 110 is greater than the thickness of the second connection portion 120. The first connection portion 110 is thicker, so that the main body of the positive electrode current collector is thicker, which is conducive to directly forming the first connection portion 110 and the second connection portion 120 on the positive electrode current collector, avoiding the positive electrode current collector from breaking during the molding process, and also avoiding the first connection portion 110 from affecting the pole core 320 when welding with the pole 250, thereby extending the service life of the pole core 320.

[0170] At the same time, by setting the thickness of the first connection part 110 to be greater than the thickness of the second connection part 120, it is also beneficial to set the thickness of the second connection part 120 to be thinner, which facilitates the welding of the second connection part 120 and the pole core 320 and increases the welding yield.

[0171] Alternatively, if Fig.14 As shown, the thickness L1 of the second connection portion 120 is 0.1 mm to 0.8 mm. When the thickness of the second connection portion 120 is small, the structural strength of the second connection portion 120 will be reduced, causing the positive electrode collector to be easily broken, thereby shortening the service life of the positive electrode collector; when the thickness of the second connection portion 120 is large, the difficulty of welding the second connection portion 120 and the pole core 320 will be increased.

[0172] Therefore, the present application sets the thickness L1 of the second connection portion 120 to 0.1 mm to 0.8 mm, which can avoid the positive electrode current collector from breaking and facilitate the welding of the second connection portion 120 and the pole core 320, thereby increasing the welding yield.

[0173] In a specific example, the thickness of the second connection portion 120 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm.

[0174] Alternatively, if Fig.14As shown, the thickness of the first connection portion 110 is L2, where 0mm<L2-L1≤0.5mm. That is, the thickness of the first connection portion 110 is greater than the thickness of the second connection portion 120, and the difference in thickness between the first connection portion 110 and the second connection portion 120 is less than 0.5mm, which can avoid the second connection portion 120 being too thick, thereby avoiding the part of the structure of the disk body 140 from being unable to effectively bulge toward the direction of the pole core 320 to form the second connection portion 120, reducing the difficulty of forming the positive electrode collector disk, and at the same time reducing the weight of the positive electrode collector disk and reducing the production cost of the positive electrode collector disk.

[0175] In a specific example, the thickness of the first connection portion 110 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.

[0176] In some embodiments, in combination Fig.15 and Fig.16 As shown, the negative electrode current collector includes a first connection portion 110, an intermediate portion 130, and a second connection portion 120. The first connection portion 110, the intermediate portion 130, and the second connection portion 120 are stacked in the axial direction of the pole core 320. The first connection portion 110 is electrically connected to the pole column 250, and the second connection portion 120 is electrically connected to the pole ear. The axial direction of the pole core 320 mentioned here can also be understood as Fig.13 As shown in the upper and lower directions, by arranging the first connecting portion 110, the middle portion 130 and the second connecting portion 120 to be stacked in the axial direction of the pole core 320, it is convenient to use the negative electrode current collecting plate to connect the two structural members (such as the pole 250 and the pole core 320) arranged in the upper and lower directions, thereby reducing the difficulty of connecting the pole 250 and the pole core 320 spaced apart in the upper and lower directions, thereby realizing the electrical connection between the pole core 320 and the pole 250, so as to facilitate the use of the pole 250 to lead the current of the pole core 320, thereby ensuring the working performance of the pole core 320, that is, ensuring the working performance of the battery cell 1000.

[0177] At the same time, by arranging the first connecting part 110, the middle part 130 and the second connecting part 120 to be stacked in the axial direction of the pole core 320, the size of the negative electrode collector in the thickness direction can also be reduced, thereby reducing the axial size of the battery cell 1000 and reducing the difficulty of assembling the battery cell 1000.

[0178] In some embodiments, during the processing of the negative electrode current collector disk, the negative electrode current collector disk is first formed into Fig.15 After the negative electrode collector plate is processed, the negative electrode collector plate is folded (such as Fig.16As shown), the first connection portion 110, the middle portion 130, and the second connection portion 120 of the negative electrode current collector are stacked in the axial direction of the pole core 320, which facilitates the use of the negative electrode current collector to achieve electrical connection between the pole 250 and the pole core 320, reduces the difficulty of connecting the pole 250 and the pole core 320, reduces the space occupied by the negative electrode current collector, and reduces the difficulty of molding the negative electrode current collector.

[0179] In some embodiments, in combination Fig.14 and Fig.15 As shown, the battery cell 1000 also includes a negative electrode cover plate 260, which is arranged on opposite sides of the pole core 320 with the cover plate 210, and the negative electrode cover plate 260 is electrically connected to the negative electrode ear of the pole core 320, so that the negative electrode cover plate 260 is used to lead out the current of the pole core 320 to ensure the working performance of the pole core 320.

[0180] It is worth noting that the above arrangement enables the battery cell 1000 to adopt a single- or double-layer current collecting plate design, which is beneficial for reducing impedance and improving the space utilization and process feasibility of the battery cell 1000 .

[0181] In some embodiments, the positive electrode current collecting disk is made of aluminum, and the negative electrode current collecting disk is made of copper.

[0182] Of course, in some other embodiments, the material of the negative electrode current collecting plate is not limited to copper, but may also be steel. When the battery cell 1000 is a sodium battery, the material of the negative electrode current collecting plate may also be aluminum, and no specific limitation is made here.

[0183] In some embodiments, Fig.15 and Fig.16 As shown, when the current collecting plate 100 includes the first connecting portion 110, the middle portion 130 and the second connecting portion 120, the second connecting portion 120 further includes an identification area 122, and the identification area 122 is arranged near the connection between the middle portion 130 and the second connecting portion 120. That is, the identification area 122 is arranged near the connection between the middle portion 130 and the second connecting portion 120, and the identification area 122 helps the staff to quickly determine the position of the connection between the middle portion 130 and the second connecting portion 120, so as to facilitate the current collecting plate 100 to be removed from the Fig.15 Folded to the shape Fig.16 The shape shown reduces the difficulty of molding the collecting plate 100 and ensures the structural accuracy of the collecting plate 100 after molding, so as to avoid reducing the area of ​​the second connecting portion 120, thereby ensuring the connection area between the collecting plate 100 and the pole core 320 and improving the working performance of the battery cell 1000.

[0184] That is to say, by providing the identification area 122 , the present application can reduce the difficulty of molding the collecting plate 100 and limit the folding position of the collecting plate 100 to ensure the connection area between the second connecting portion 120 and the pole core 320 .

[0185] In some embodiments, Fig.16 As shown, the line between the opposite side walls of the middle part 130 and the connection point of the second connecting part 120 is the first connecting line T1, and the minimum distance between the marking area 122 and the first connecting line T1 ranges from -2mm to +2mm. It can also be understood here that the line between the middle part 130 and the second connecting part 120 is the first connecting line T1, and there are multiple distances between the marking area 122 and the first connecting line T1, and the minimum distance is -2mm to +2mm, wherein the minimum distance between the marking area 122 and the first connecting line T1 can also be understood as Fig.16 T2 shown in FIG.

[0186] It should be noted that when the minimum distance between the identification area 122 and the first connecting line T1 is less than -2 mm, the area of ​​the second connecting portion 120 will be reduced, thereby reducing the connection area between the second connecting portion 120 and the pole core 320; when the minimum distance between the identification area 122 and the first connecting line T1 is greater than 2 mm, the area of ​​the middle portion 130 will be reduced, reducing the structural strength of the middle portion 130, and also causing the first connecting portion 110, the middle portion 130 and the second connecting portion 120 to be unable to be stacked in the axial direction of the pole core 320, affecting the performance of the collecting plate 100.

[0187] Therefore, the present application sets the value range of the minimum distance between the identification area 122 and the first connecting line T1 to -2mm to +2mm, while ensuring the connection area between the second connecting portion 120 and the pole core 320, the area of ​​the middle portion 130 can also be ensured, so that the first connecting portion 110, the middle portion 130 and the second connecting portion 120 can be effectively stacked in the axial direction of the pole core 320 to ensure the performance of the collecting plate 100.

[0188] In a specific example, the minimum distance between the marking area 122 and the first connecting line T1 is -2 mm, -1 mm, 0 mm, 1 mm or 2 mm.

[0189] Alternatively, if Fig.15As shown, the maximum width of the identification area 122 is D3, and the minimum width of the middle part 130 is D4, wherein 0.2<D3 / D4<1. That is, the maximum width of the identification area 122 is smaller than the minimum width of the middle part 130, and the ratio of the maximum width of the identification area 122 to the minimum width of the middle part 130 is greater than 0.2, so that while avoiding the reduction of the structural strength of the collector plate 100 due to the provision of the identification area 122, it can also ensure that the identification area 122 has a certain width, so that it is convenient to use the identification area 122 to limit the folding position of the collector plate 100, and reduce the difficulty of molding the collector plate 100.

[0190] In some embodiments, the ratio of the maximum width of the logo area 122 to the minimum width of the middle portion 130 is 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9, etc.

[0191] In some embodiments, in combination Fig.15 and Fig.16 As shown, the identification area 122 is a through hole penetrating the second connection part 120 or a groove provided on the second connection part 120. That is to say, the identification area 122 can be formed as a through hole penetrating the second connection part 120, or can be formed as a groove provided on the second connection part 120. No specific limitation is made here, as long as it is ensured that the position of the identification area 122 can be visually observed by the staff, so as to facilitate the use of the identification area 122 to determine the folding position of the collecting plate 100.

[0192] The figure shows that the shape of the identification area 122 is a triangle, but in some other embodiments, the shape of the identification area 122 may also be a rectangle, a circle, an ellipse or an irregular shape.

[0193] In some embodiments, Fig.13 and Fig.14 As shown, the battery cell 1000 is a cylindrical battery, so that the battery cell 1000 has the advantages of high capacity, long cycle life, and wide operating environment temperature range, thereby ensuring the working performance of the battery cell 1000.

[0194] The battery assembly of the embodiment of the utility model is described below.

[0195] A battery assembly according to an embodiment of the present invention includes: a plurality of battery cells 1000 .

[0196] 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.

[0197] It can be seen from the above structure that the battery assembly of the embodiment of the utility model can ensure the connection quality between multiple battery cells 1000 and ensure the working performance of the battery assembly by adopting the aforementioned battery cells 1000.

[0198] It should be noted that the battery assembly mentioned here can be a battery pack or a battery module.

[0199] The electrical device of the embodiment of the utility model is described below.

[0200] An electrical device according to an embodiment of the utility model includes: a battery assembly.

[0201] Among them, the battery assembly is the aforementioned battery assembly, and the specific structure of the battery assembly is not described here.

[0202] It can be seen from the above structure that the electrical device of the embodiment of the utility model improves the working performance of the electrical device by adopting the above-mentioned battery assembly.

[0203] 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.

[0204] 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.

[0205] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0206] The specific structures of the pole assembly 200 of the battery cell 1000 according to the embodiment of the utility model, the battery cell 1000, the battery assembly and other components of the electrical device such as the pole core 320 are known to ordinary technicians in the field and will not be described in detail here.

[0207] 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.

[0208] 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 pole assembly, characterized in that: include: A pole, wherein a liquid injection channel is provided in the pole; A sealing cover, wherein the sealing cover comprises a main body and a connecting protrusion, wherein the main body is welded to the pole to seal the injection channel, a weld is formed at the connection between the main body and the pole, the connecting protrusion is arranged on a first end face of the main body in the thickness direction away from the injection channel, the connecting protrusion is suitable for connecting to a bus, the connecting protrusion protrudes from the main body to form a step for accommodating the weld, so that the protruding height of the connecting protrusion is greater than or equal to the maximum height of the weld protruding from the first end face.

2. The battery cell pole assembly according to claim 1, characterized in that: In the thickness direction of the main body, the connecting protrusion protrudes in a direction away from the injection channel and protrudes from the pole.

3. The battery cell pole assembly according to claim 1, characterized in that: The main body is provided with a second end face in the thickness direction facing the injection channel, the second end face and the orthographic projection of the connecting protrusion in the thickness direction of the sealing cover at least partially overlap, and the second end face is provided with a thinning groove at least partially arranged opposite to the connecting protrusion.

4. The battery cell pole assembly according to claim 3, characterized in that: The groove depth of the thinning groove is greater than or equal to the protrusion height of the connecting protrusion.

5. The battery cell pole assembly according to claim 4, characterized in that: The thinning groove is spaced apart from the outer peripheral wall of the main body, and the minimum spacing ranges from 0.8 mm to 3.6 mm.

6. The battery cell pole assembly according to any one of claims 1 to 5, characterized in that: The main body includes a connected sealing portion and an overlapping portion, wherein the sealing portion is located in the injection channel, the overlapping portion is arranged on at least a portion of the outer periphery of the sealing portion, and the overlapping portion is placed on the end face of the pole and is welded to the pole.

7. The battery cell pole assembly according to claim 6, characterized in that: In the thickness direction of the sealing cover, a portion of the orthographic projection of the connecting protrusion coincides with the orthographic projection of the overlapping portion.

8. The battery cell pole assembly according to claim 6, characterized in that: The thickness of the overlapping portion ranges from 0.3 mm to 1 mm.

9. The battery cell terminal assembly according to claim 6, characterized in that: The thickness of the blocking portion is greater than the protrusion height of the connecting protrusion.

10. The battery cell pole assembly according to any one of claims 1 to 5, characterized in that: The inner wall of the injection channel is provided with a groove, the groove extends to the end face of the pole, the side wall of the groove defines a support surface, the main body is supported on the support surface, and the outer peripheral wall of the main body and the inner peripheral wall of the groove are welded.

11. The battery cell pole assembly according to claim 10, characterized in that: The first end surface protrudes from the end surface of the pole.

12. The battery cell pole assembly according to claim 11, characterized in that: The distance between the first end face and the end face of the pole is in the range of 0.05 mm to 1 mm.

13. The battery cell terminal assembly according to claim 10, characterized in that: A first chamfer is provided between the groove and the end face of the pole, a second chamfer is provided between the outer peripheral wall of the main body and the first end face, the first chamfer and the second chamfer are arranged at intervals, and solder is provided between the first chamfer and the second chamfer.

14. The battery cell terminal assembly according to claim 10, characterized in that: The inner peripheral wall of the groove extends obliquely relative to the support surface in a direction away from the center of the injection channel, and the outer peripheral wall of the main body is matched with the inner peripheral wall of the groove.

15. The battery cell pole assembly according to claim 14, characterized in that: The angle between the inner peripheral wall of the groove and the supporting surface is a, wherein 90°<a≤150°.

16. The battery cell terminal assembly according to claim 1, characterized in that: The pole includes a bottom plate and a side plate, wherein the side plate is connected to one side of the bottom plate in the thickness direction and extends along the circumference of the bottom plate to define the injection channel, and the bottom plate is provided with an injection hole connected to the injection channel, and a sealing member is provided at the injection hole to seal it, and the bottom plate is suitable for being electrically connected to the pole core.

17. A battery cell, characterized in that: include: A housing, wherein the housing forms a receiving cavity; A pole core, which is disposed in the accommodating cavity and has a pole ear; A pole assembly, wherein the pole assembly is the pole assembly according to any one of claims 1 to 16, wherein the pole assembly is insulated and connected to the housing, and the pole lug is electrically connected to the pole assembly.

18. A battery assembly, characterized in that: The invention comprises a plurality of battery cells according to claim 17 .

19. An electrical device, characterized in that: Comprising a battery assembly according to claim 18.

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