Terminal assembly of battery cell, battery cell, battery assembly, and electrical apparatus

Abstract

Disclosed in the present application are a terminal assembly of a battery cell, a battery cell, a battery assembly and an electrical apparatus. The terminal assembly comprises a terminal and a seal cap, a liquid injection channel being provided in the terminal, and the seal cap comprising a body portion and a connection protrusion; the body portion is in a welded fitting to the terminal so as to block the liquid injection channel, a welding seam being formed at a joint of the body portion and the terminal; the connection protrusion is arranged on the first end surface of the body portion facing away from the liquid injection channel in the thickness direction, and the connection protrusion is suitable for being connected to a busbar; the connection protrusion protrudes from the body portion so as to form a step for accommodating the welding seam, such that the connection protrusion protrudes by a height greater than or equal to the maximum height of the welding seam protruding from the first end surface.

Description

Battery cell pole assembly, battery cell, battery assembly and electrical device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 27, 2024, with application number 202420627801.X and application name “Battery cell pole assembly, battery cell, battery assembly and electrical device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and more specifically, to a battery cell pole assembly, a battery cell, a battery assembly, and an electrical device. Background Art

[0003] In the prior art, after the liquid is injected into the injection channel, a sealing cover is usually provided to seal the injection channel to prevent external foreign matter from entering the battery cell through the injection channel. At the same time, it can also prevent the electrolyte inside the battery cell from overflowing from the injection channel, thereby ensuring the working performance of the battery cell.

[0004] 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. However, the welding between the existing sealing cover and the bus bar is relatively unstable, which affects the welding yield of the bus bar. Summary of the Invention

[0005] The purpose of the present application 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.

[0006] In the first aspect, the present application discloses a pole assembly of a battery cell, comprising: 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, the main body being welded to the pole to seal the liquid injection channel, a weld being formed at the connection between the main body and the pole, the connecting protrusion being provided on a first end face of the main body in the thickness direction facing away from the liquid injection channel, the connecting protrusion being suitable for connecting to a bus, the connecting protrusion protruding 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.

[0007] According to the electrode assembly of the battery cell in the embodiment of the present application, a connecting protrusion is provided on the first end face of the main body portion of the sealing cover in the thickness direction away from the injection channel, and the connecting protrusion is provided to protrude from the main body portion, so as to form 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 portion and the electrode from affecting the connection between the connecting protrusion and the bus, thereby facilitating the use of the connecting protrusion to achieve 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.

[0008] 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.

[0009] In some embodiments, the main body is provided with a second end face facing the injection channel in the thickness direction, the second end face and the positive 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.

[0010] In some embodiments, the groove depth of the thinning groove is greater than or equal to the protrusion height of the connecting protrusion.

[0011] 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.

[0012] In some embodiments, the main body includes a connected sealing portion and a lap portion, the sealing portion is located in the injection channel, the lap portion is provided on at least a portion of the outer periphery of the sealing portion, and the lap portion is placed on the end face of the pole and is welded to the pole.

[0013] 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.

[0014] In some embodiments, the thickness of the overlapping portion ranges from 0.3 mm to 1 mm.

[0015] In some embodiments, the thickness of the blocking portion is greater than the protrusion height of the connecting protrusion.

[0016] 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.

[0017] In some embodiments, the first end surface protrudes from the end surface of the pole.

[0018] In some embodiments, a distance between the first end face and the end face of the pole is in the range of 0.05 mm to 1 mm.

[0019] 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.

[0020] 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 is adapted to the inner circumferential wall of the groove.

[0021] In some embodiments, the angle between the inner peripheral wall of the groove and the support surface is a, wherein 90°<a≤150°.

[0022] 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.

[0023] In the second aspect, the present application discloses a battery cell, comprising: a shell, the shell forming a accommodating cavity; a pole core, the pole core being arranged in the accommodating cavity and having a pole ear; a pole assembly, the pole assembly being the aforementioned pole assembly, the pole assembly being insulated and connected to the shell, and the pole ear being electrically connected to the pole assembly.

[0024] According to the battery cell of the present application, the aforementioned terminal assembly is adopted to ensure the connection quality between the sealing cover and the busbar, thereby improving the working performance of the battery cell.

[0025] In a third aspect, the present application discloses a battery assembly comprising a plurality of the aforementioned battery cells.

[0026] According to the battery assembly of the present application, by adopting the aforementioned battery cells, the connection quality between the multiple battery cells can be guaranteed, thereby ensuring the working performance of the battery assembly.

[0027] In a fourth aspect, the present application discloses an electrical device comprising the aforementioned battery assembly.

[0028] According to the electric device of the present application, the operating performance of the electric device is improved by adopting the aforementioned battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] FIG1 is a partial cross-sectional view of a battery cell connected to a busbar in some embodiments of the first aspect of the present application;

[0031] FIG2 is a partial cross-sectional view of a battery cell in some embodiments of the second aspect of the present application;

[0032] FIG3 is a partial enlarged view of area I in FIG2;

[0033] FIG4 is a schematic diagram of a sealing cover according to some embodiments of the second aspect of the present application;

[0034] FIG5 is a cross-sectional view of a sealing cover according to some embodiments of the second aspect of the present application;

[0035] FIG6 is a schematic diagram of a pole according to some embodiments of the present application;

[0036] FIG7 is a partial cross-sectional view of a battery cell according to some embodiments of the first aspect of the present application;

[0037] FIG8 is a cross-sectional view of a sealing cover according to some embodiments of the first aspect of the present application;

[0038] FIG9 is a schematic diagram of a sealing cover according to some embodiments of the third aspect of the present application;

[0039] FIG10 is a cross-sectional view of a sealing cover according to some embodiments of the third aspect of the present application;

[0040] FIG11 is a partial cross-sectional view of a battery cell in some embodiments of the third aspect of the present application;

[0041] FIG12 is a schematic diagram of a battery cell according to some embodiments of the present application;

[0042] FIG13 is an exploded view of a battery cell according to some embodiments of the present application;

[0043] FIG14 is a schematic diagram of a current collecting plate according to some embodiments of the present application;

[0044] FIG15 is a schematic diagram of the current collecting disk and the negative electrode cover in some other embodiments of the present application, wherein the current collecting disk is in an unfolded state;

[0045] FIG16 is a schematic diagram of a current collecting tray according to some other embodiments of the present application, wherein the current collecting tray is in the folding process;

[0046] FIG17 is a schematic diagram of a battery assembly according to some embodiments of the present application;

[0047] FIG18 is a schematic diagram of an electrical device according to some embodiments of the present application.

[0048] Reference Signs: 1000, battery cell; 100, current collecting tray; 110, first connecting portion; 120, second connecting portion; 122, identification area; 130, middle portion; 140, tray body; 200, terminal assembly; 210, cover plate; 220, blocking member; 230, sealing cover; 231, main body; 2311, first end surface; 2312, blocking portion; 2313, overlapping portion; 232, connecting protrusion; 234, second end surface; 2341, thinning groove; 235, second chamfer; 250, terminal; 211, injection channel; 2111, groove; 2112, supporting surface; 213, first chamfer; 251, end surface; 2113, bottom plate; 2119, side plate; 2114, injection hole; 260, negative electrode cover; 270, top spacer; 290, weld; 400, insulation; 430, insulation sheet; 440, sealing ring; 500, buffer; 800, protective sheet; 300, outer shell; 310, receiving cavity; 320, pole core; 321, pole ear; 2000, busbar; 3000, battery assembly; 4000, electrical device. DETAILED DESCRIPTION

[0049] The following describes in detail embodiments of the present application. 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 application and are not to be construed as limiting the present application.

[0050] In the description of the present application, 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 application and simplifying the description, and do not indicate or imply that the device or element referred to 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 application.

[0051] The following describes the terminal assembly 200 of the battery cell 1000 according to an embodiment of the present application with reference to the accompanying drawings.

[0052] 1 , 2 and 3 , the electrode assembly 200 of the battery cell 1000 according to the embodiment of the present application includes: an electrode 250 and a sealing cover 230 .

[0053] As shown in Figures 1 and 2 , a liquid injection channel 211 is provided in the pole 250. The liquid injection channel 211 is used to connect the two opposite sides of the pole 250, thereby facilitating liquid injection into the pole core 320 (the specific structure of the pole core 320 can be seen in Figures 1, 2, and 13 ), thereby ensuring the operating performance of the pole core 320, and thus ensuring the operating performance of the battery cell 1000.

[0054] As shown in Figures 1 to 5, the sealing cover 230 includes a main body 231 and a connecting protrusion 232. The main body 231 is welded to the pole 250 to seal 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 on 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 to the bus 2000. The connecting protrusion 232 protrudes from the main body 231 to form a step to accommodate the weld 290, so that the protruding 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 and the pole 250 are welded together 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 the up and down direction shown in Figure 1), the main body 231 has a first end face 2311 away from the injection channel 211, and the connecting protrusion 232 is provided on the first end face 2311 and the connecting protrusion 232 is protruded from the main body 231 to form a step on the sealing cover 230 to accommodate the weld 290. Because the weld 290 is accommodated in the step In this way, the protrusion height of the connecting protrusion 232 (the protrusion height of the connecting protrusion 232 can be understood as H4 shown in Figure 5) 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 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.

[0055] 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 that accommodates 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.

[0056] That is to say, the present application provides 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.

[0057] 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.

[0058] In some embodiments, the sealing cover 230 is formed by stamping to reduce the difficulty of forming the sealing cover 230 .

[0059] In some embodiments, the sealing cover 230 and the pole 250 are sealed by laser welding, thereby achieving the purpose of using the sealing cover 230 to block the injection channel 211.

[0060] It can be seen from the above structure that the pole assembly 200 of the battery cell 1000 of the embodiment of the present application 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 face 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.

[0061] 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.

[0062] 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 terminal post 250 . Among them, the welding 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 is welded to the pole 250. By setting the protrusion height of the connecting protrusion 232 to be greater than or equal to the welding height of the sealing cover 230 and the pole 250, a step for accommodating the weld 290 can be formed on the sealing cover 230 using the connecting protrusion 232, so that the weld 290 can be accommodated in the step, thereby making the protrusion height of the connecting protrusion 232 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 busbar 2000, further ensuring the connection quality of the connecting protrusion 232 and the busbar 2000, and improving the welding yield of the busbar 2000.

[0063] Therefore, the above can also be understood as that the present application provides a connecting protrusion 232 on the sealing cover 230, and sets the protrusion height of the connecting protrusion 232 to be greater than or equal to the welding height between the sealing cover 230 and the pole 250, so as to avoid the welding 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 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.

[0064] In some embodiments, when the sealing cover 230 and the pole 250 are formed as aluminum structures, the protrusion height H4 of the connecting protrusion 232 is ≥0.05 mm; when the sealing cover 230 and the pole 250 are formed as steel structures, the protrusion height H4 of the connecting protrusion 232 is >0 mm, thereby ensuring that the protrusion height of the connecting protrusion 232 can be greater than or equal to the welding height between the sealing cover 230 and the pole 250, solving the technical problem in the prior art that the welding height between the sealing cover 230 and the pole 250 affects the welding yield of the bus 2000 and the sealing cover 230.

[0065] In some embodiments, as shown in Figure 6, 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, and the bottom plate 2113 is provided with an injection hole 2114 connected to the injection channel 211, and a sealing member 220 is provided at the injection hole 2114 to seal it, and 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, it is convenient to inject liquid into the pole core 320 through the injection channel 211, thereby ensuring the injection effect, and providing a sealing member 220 at the injection hole 2114 to block the injection hole 2114, thereby achieving the purpose of blocking 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.

[0066] 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, which makes it convenient to use the pole column 250 to draw out the current of the pole core 320 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.

[0067] 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 column 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.

[0068] 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 .

[0069] 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.

[0070] 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 .

[0071] 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 seal the injection channel 211.

[0072] At the same time, by sealing the outlet end of the injection channel 211 with a sealing nail, welding slag can be prevented 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.

[0073] In some embodiments, the pole 250 is formed by stamping.

[0074] Optionally, the pole 250 is made of aluminum, which is connected to the collecting plate 100 (the specific structure of the collecting plate 100 can be seen in Figure 13), and 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 convenient to use the pole 250 to draw out the current of the pole core 320 and ensure the working performance of the pole core 320.

[0075] In some embodiments, as shown in Figures 1, 2, and 3, 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. In the structure shown in Figures 1 and 2, it can also be understood that the connecting protrusion 232 protrudes upward and protrudes from the pole 250. In this way, the connecting surface of the connecting protrusion 232 can be formed on the axial outside of the pole 250, so as to prevent the pole 250 from affecting the connection between the connecting protrusion 232 and the busbar 2000, reduce the difficulty of connecting the sealing cover 230 to the busbar 2000, and at the same time ensure the connection quality of the connecting protrusion 232 and the busbar 2000, thereby improving the welding yield of the busbar 2000.

[0076] In some embodiments, in combination with Figures 2, 4 and 5, 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 positive projections, and the second end face 234 is provided with a thinning groove 2341 that is 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 at least partially overlap, 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. When a 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. Through the above arrangement, the thickness of the sealing cover 230 caused by the provision of the connecting protrusion 232 can be avoided. While reducing the production cost of the sealing cover 230, the structural strength of the sealing cover 230 can also be reduced, ensuring 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.

[0077] That is to say, the present application sets a connecting protrusion 232 on the first end face 2311 of the sealing cover 230, and 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.

[0078] In the description of this application, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0079] 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 H10 shown in Figure 5. 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 ensured, thereby avoiding the thickness of the sealing cover 230 being too thick due to the provision 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 terminal 250.

[0080] In some embodiments, the depth of the thinning groove 2341 is equal to the height of the connecting protrusion 232. This ensures the thinning effect of the thinning groove 2341 while also preventing the structural strength of the sealing cover 230 from being excessively reduced due to the provision of the thinning groove 2341. In other words, the sealing cover 230 is ensured to have a certain structural strength, thereby ensuring the sealing quality of the sealing cover 230.

[0081] In some embodiments, as shown in FIG. 5 , the thinning groove 2341 is spaced apart from the outer peripheral wall of the main body 231 , and the minimum spacing ranges from 0.8 mm to 3.6 mm. Among them, 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 closest 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 H1 shown in Figure 5. When the minimum spacing 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 spacing 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.

[0082] Therefore, the present application sets the minimum distance 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, it can also reduce the molding difficulty of the sealing cover 230, while ensuring the structural strength of the sealing cover 230 and improving the sealing effect of the sealing cover 230.

[0083] 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.

[0084] In some embodiments, in combination with FIG9, FIG10 and FIG11, the main body 231 includes a connected sealing portion 2312 and a lap portion 2313. The sealing portion 2312 is located in the liquid injection channel 211, and the lap portion 2313 is provided on at least a portion of the outer periphery of the sealing 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, or can 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 liquid 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 provided 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 set opposite the injection channel 211, so that the sealing portion 2312 can be used 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.

[0085] At the same time, by configuring the main body 231 to include the blocking portion 2312 and the overlapping portion 2313 , the top of the pole 250 can be formed into a single step when processing the pole 250 , thereby increasing the processing feasibility of the pole 250 and reducing the processing cost.

[0086] Optionally, the overlapping portion 2313 and the terminal post 250 are welded by penetration welding, which reduces the difficulty of assembling the sealing cover 230 and the terminal post 250 , thereby improving the process yield of the battery cell 1000 .

[0087] In some embodiments, in combination with Figures 10 and 11, in the thickness direction of the sealing portion 2312, the overlapping portion 2313 is arranged near 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, the sealing portion 2312 can block the injection channel 211.

[0088] In some embodiments, as shown in FIG10 , a portion of the orthographic projection of the connecting protrusion 232 overlaps with the orthographic projection of the overlapping portion 2313 in the thickness direction of the sealing cover 230. This allows at least a portion of the connecting protrusion 232 to be connected to the overlapping portion 2313. This allows the connecting protrusion 232 to be used to connect the sealing cover 230 to the busbar 2000 while also improving the structural strength of the overlapping portion 2313. This facilitates the welding of the sealing cover 230 to the terminal 250 using the overlapping portion 2313, thereby reducing the difficulty of assembling the sealing cover 230 and the terminal 250 and improving the quality of the connection between the sealing cover 230 and the terminal 250.

[0089] 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 is 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 the weld 290 being formed on the connecting protrusion 232 when the overlapping portion 2313 is welded to the pole 250, thereby avoiding the weld 290 affecting 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.

[0090] In some embodiments, the minimum distance 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 smaller than the radius of the main body 231 . Among them, 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 H9 shown in Figure 10, and the welding width refers to the width of the melting area of ​​the weld 290 during the welding process of the overlapping portion 2313 and the pole 250. Since the overlapping portion 2313 and the pole 250 are penetrated welded, the above-mentioned arrangement ensures the welding quality of the overlapping portion 2313 and the pole 250 and avoids the welding connection between the overlapping portion 2313 and the pole 250. While the weld 290 is formed on the connecting protrusion 232, the width of the connecting protrusion 232 can also be ensured, thereby ensuring the connection quality of the sealing cover 230 and the busbar 2000.

[0091] In some embodiments, the thickness of the overlap portion 2313 ranges from 0.3 mm to 1 mm. The thickness of the overlap portion 2313 mentioned here can be understood as H2 shown in FIG10 . When the overlap portion 2313 is thin, the structural strength of the overlap portion 2313 is reduced, affecting the working performance of the overlap portion 2313 . When the overlap portion 2313 is thick, the overlap portion 2313 and the terminal 250 cannot be penetrated and welded, thereby reducing the welding yield of the terminal 250 .

[0092] 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.

[0093] In some embodiments, the thickness of the overlapping portion 2313 is 0.3 mm, 0.5 mm, 0.8 mm, or 1 mm.

[0094] 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 H8 shown in Figure 10. By setting the thickness of the blocking portion 2312 to be greater than the protrusion height of the connecting protrusion 232, the contact area between the blocking portion 2312 and the injection channel 211 can be increased, thereby ensuring the blocking effect of the blocking portion 2312. At the same time, the overall height of the sealing cover 230 can be ensured, and the connecting protrusion 232 can be prevented from being welded through the sealing cover 230 when welding the busbar 2000. In this way, while ensuring the sealing effect of the sealing cover 230, welding slag caused by welding the connecting protrusion 232 to the busbar 2000 can be prevented from flowing into the injection channel 211.

[0095] 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 relatively small, not only is the sealing effect of the sealing cover 230 reduced, but there is also 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 relatively large, the space occupied by the sealing cover 230 is increased, the manufacturing cost of the sealing cover 230 is increased, and the assembly difficulty of the sealing cover 230 and the injection channel 211 is increased.

[0096] Therefore, the present application sets the overall height H7 of the sealing cover 230 to 0.8mm-5mm. This ensures the sealing effect of the sealing cover 230 while preventing the connecting protrusion 232 and the bus bar 2000 from welding through the sealing cover 230 to cause welding slag, poor appearance, etc.

[0097] 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.

[0098] In some embodiments, as shown in conjunction with Figures 2-8 , the inner wall of the injection channel 211 is provided with a groove 2111, which extends to the end face 251 of the electrode 250 (the specific structure of the groove 2111 can be seen in Figure 3 ). The sidewall of the groove 2111 defines a support surface 2112, and the body 231 is supported on the support surface 2112. The outer peripheral wall of the body 231 is welded to the inner peripheral wall of the groove 2111. It can also be understood that the welding of the body 231 and the electrode 250 is not limited to the body 231 being provided with a sealing portion 2312 and a lap portion 2313, and the lap portion 2313 being placed on the end face 251 of the electrode 250. The groove 2111 extending to the end face 251 of the electrode 250 can also be provided on the inner wall of the injection channel 211.

[0099] Among them, by extending the groove 2111 to the end face 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 that at least a portion of the sealing cover 230 is set in the groove 2111, and the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111 are welded together. In this way, the welding cooperation between the sealing cover 230 and the pole 250 can be achieved, so that the sealing cover 230 is used 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 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.

[0100] 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 mating connection between the sealing cover 230 and the pole 250 and ensure connection quality.

[0101] In some embodiments, as shown in FIG3 , the outer peripheral wall of the connecting protrusion 232 is located radially inward of the outer peripheral wall of the body portion 231 in the radial direction of the pole 250. This allows the connecting protrusion 232 to be positioned away from the pole 250, thereby preventing the connecting protrusion 232 from interfering with the butt welding between the outer peripheral wall of the body portion 231 and the inner peripheral wall of the groove 2111, thereby reducing the difficulty of connecting the sealing cover 230 to the pole 250.

[0102] In some embodiments, as shown in Figure 3, the connecting protrusion 232 is spaced apart from the outer peripheral wall of the main body 231. While avoiding the connecting protrusion 232 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 avoid that the weld 290 is 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.

[0103] 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 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 . Among them, the minimum distance between the connecting protrusion 232 and the outer peripheral wall of the main body 231 mentioned here can be understood as H5 shown in Figure 8, and the welding fusion 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 fusion width will be formed on the outer 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 together, and at the same time, the width of the connecting protrusion 232 can be guaranteed, thereby ensuring the connection quality of the sealing cover 230 and the bus 2000.

[0104] In some embodiments, as shown in FIG3 , a first chamfer 213 is provided between the groove 2111 and the end surface of the terminal 250, and 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 spaced apart, and solder is disposed between the first chamfer 213 and the second chamfer 235. This ensures the welding quality between the body 231 and the terminal 250 and improves the sealing effect of the sealing cover 230.

[0105] 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 assembly efficiency, and also reduce the molding difficulty of the sealing cover 230 and the pole 250.

[0106] It should be noted that FIG3 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 beveled corners, which is not specifically limited here.

[0107] In some embodiments, as shown in FIG3 , the first end surface 2311 protrudes from the end surface 251 of the terminal 250. This ensures that the connecting protrusion 232 can protrude from the terminal 250 while also allowing the solder to flow between the outer peripheral wall of the body portion 231 and the inner peripheral wall of the groove 2111 under the action of gravity during welding, thereby ensuring the quality of the welding between the body portion 231 and the terminal 250.

[0108] In some embodiments, the spacing between the first end face 2311 and the end face 251 of the pole 250 is in the range of 0.05 mm to 1 mm. The spacing between the first end face 2311 and the end face 251 of the pole 250 mentioned here can be understood as H3 shown in FIG3 . 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 between the outer peripheral wall of the body portion 231 and the inner peripheral wall of the groove 2111, such as: the solder flows between the first chamfer 213 and the second chamfer 235, thereby reducing the fitting clearance between the body portion 231 and the pole 250, improving the welding yield, reducing the assembly precision requirement, and improving the process feasibility.

[0109] Of course, in some other embodiments, when no chamfer is provided between the groove 2111 and the end face of the pole 250 and between the outer peripheral wall of the main body 231 and the first end face 2311 (as shown in conjunction with Figures 7 and 8), the first end face 2311 can also be set to be flush with the end face 251 of the pole 250. This is because when the pole 250 and the sealing cover 230 are formed into the structure of Figures 7 and 8, the contact area between the outer peripheral wall of the main body 231 and the inner peripheral wall of the groove 2111 can be guaranteed.

[0110] 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.

[0111] In some embodiments, as shown in FIG3 , 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 main body 231 is adapted to the inner circumferential wall of the groove 2111. By obliquely extending the inner circumferential wall of the groove 2111 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 fitting the outer circumferential wall of the main body 231 and the inner circumferential wall of the groove 2111, and ensuring that part of the structure of the main body 231 can be effectively assembled into the injection channel 211.

[0112] At the same time, by matching the outer peripheral wall of the main body 231 with the inner peripheral wall of the groove 2111, the contact area between the main body 231 and the pole 250 can be increased, ensuring the welding quality of the sealing cover 230 and the pole 250, thereby achieving the purpose of using the sealing cover 230 to seal the liquid injection channel 211.

[0113] In some embodiments, as shown in FIG3 , the angle between the inner circumferential wall of the groove 2111 and the support surface 2112 is a, where 90°<a≤150°. This ensures that the inner circumferential wall of the groove 2111 can effectively extend at an angle relative to the support surface 2112 away from the center of the injection channel 211, thereby improving the assembly of the sealing cover 230 and the groove 2111 and reducing the difficulty of assembly. It also ensures the contact area between the outer circumferential wall of the body 231 and the inner circumferential wall of the groove 2111, thereby ensuring the quality of the weld between the sealing cover 230 and the terminal 250.

[0114] In some embodiments, the angle between the inner circumferential wall of the groove 2111 and the support surface 2112 is 100°, 110°, 120°, 130°, 140°, or 150°, etc.

[0115] The battery cell 1000 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0116] 12 and 13 , a battery cell 1000 according to an embodiment of the present application includes: a housing 300 , a pole core 320 , and a pole assembly 200 .

[0117] The housing 300 forms a receiving cavity 310, and the pole core 320 is disposed in the receiving cavity 310 and has a pole ear 321. Thus, the pole core 320 is disposed within the housing 300, making it easier to utilize the housing 300 to protect the pole core 320, extend the service life of the pole core 320, and improve the safety of the pole core 320.

[0118] The pole assembly 200 is the aforementioned pole assembly 200. The specific structure of the pole assembly 200 is not described in detail here. The pole assembly 200 is insulated from the housing 300, and the tab 321 is electrically connected to the pole assembly 200. This means that when the pole assembly 200 is insulated from the housing 300, the tab 321 of the pole core 320 is electrically connected to the pole assembly 200, thereby achieving an electrical connection between the pole core 320 and the pole assembly 200. This facilitates the use of the pole assembly 200 to draw current from the pole core 320, thereby ensuring the operating performance of the battery cell 1000.

[0119] In some embodiments, the tab 321 is electrically connected to the pole 250 , which ensures the electrical connection between the pole core 320 and the pole assembly 200 while reducing the difficulty of the electrical connection between the pole core 320 and the pole assembly 200 .

[0120] As can be seen from the above structure, the battery cell 1000 of the embodiment of the present application adopts the aforementioned terminal assembly 200 to ensure the connection quality between the sealing cover 230 and the busbar 2000, thereby improving the working performance of the battery cell 1000.

[0121] In some embodiments, the housing 300 is formed by stamping or welding, and the material of the housing 300 is aluminum or steel.

[0122] In some embodiments, as shown in Figures 1, 2 and 12, the battery cell 1000 includes a cover plate 210, and the pole 250 is passed 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.

[0123] In some embodiments, as shown in Figures 2, 7 and 11, the battery cell 1000 also includes an insulating member 400, which is disposed on the cover plate 210 and located between the pole 250 and the cover plate 210 to insulate the cover plate 210 and the pole 250, thereby avoiding electrical connection between the cover plate 210 and the pole 250 to ensure the working performance of the battery cell 1000.

[0124] In some embodiments, as shown in Figures 2, 7 and 11, the insulating member 400 includes an insulating sheet 430 and a sealing ring 440. The insulating sheet 430 and the sealing ring 440 are arranged on opposite sides of the cover plate 210 to enable the insulating member 400 to be arranged between the pole 250 and the cover plate 210, thereby achieving an insulating spacing between the cover plate 210 and the pole 250 and reducing the difficulty of installing the insulating member 400 on the cover plate 210.

[0125] In some embodiments, the insulating sheet 430 is arranged on the outside of the cover plate 210, and the sealing ring 440 is arranged on the inside 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 gap. 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.

[0126] In some embodiments, as shown in Figures 2, 7, and 11, the battery cell 1000 further includes a buffer member 500, which is disposed between the insulating member 400 and the terminal 250. This prevents the terminal 250 from damaging the insulating member 400 during the molding process, extends the service life of the insulating member 400, and ensures the insulation performance of the insulating member 400.

[0127] 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.

[0128] In some embodiments, the buffer 500 is stamped from aluminum, which reduces the difficulty of forming the buffer 500 while also allowing the buffer 500 to have a certain structural strength, thereby facilitating the use of the buffer 500 to limit and support the pole 250, thereby improving the structural strength of the pole 250 after forming, and preventing the pole 250 from damaging the insulating part 400 during the forming process, thereby extending the service life of the insulating part 400.

[0129] It should be noted that the aluminum material mentioned above can be 1 series aluminum or other series aluminum, and is not specifically limited here.

[0130] 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 inside the battery cell 1000, thereby improving the safety of the battery cell 1000.

[0131] In some embodiments, as shown in FIG12 , the battery cell 1000 further includes a protective 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.

[0132] In some embodiments, as shown in Figures 2, 7 and 11, 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 portion 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 damaging the explosion-proof valve, thereby ensuring the performance of the explosion-proof valve.

[0133] In some embodiments, as shown in FIG13 , the battery cell 1000 further includes a current collecting plate 100 , which is disposed between the electrode core 320 and the electrode post assembly 200 and is electrically connected to the electrode tab 321 and the electrode post 250 , respectively. This allows for electrical connection between the electrode tab 321 and the electrode post 250 , reducing the difficulty of connecting the electrode tab 321 and the electrode post 250 .

[0134] In some embodiments, the collecting plate 100 is welded to the pole tab 321 and the pole post 250 respectively. In this way, while the pole tab 321 and the pole post 250 can form an electrical connection, the connection strength between the pole tab 321 and the pole post 250 can be ensured, and the connection difficulty between the pole tab 321 and the pole post 250 can be reduced, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0135] 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 electrode ear and a negative electrode ear, the positive current collecting plate is electrically connected to the positive electrode ear of the pole core 320, and the negative current collecting plate is electrically connected to the negative electrode ear of the pole core 320 to ensure the working performance of the pole core 320.

[0136] In some embodiments, as shown in Figures 13 and 14, the positive 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 321, thereby realizing 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.

[0137] In some embodiments, the positive current collecting disc is formed by stamping to form a first connecting portion 110 protruding toward the pole assembly 200 and a second connecting portion 120 protruding toward the pole core 320 on the positive current collecting disc, thereby reducing the difficulty of forming the positive current collecting disc.

[0138] 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 current flow path, reducing impedance and heat generation, ensuring the working performance of the battery cell 1000, and improving the safety of the battery cell 1000.

[0139] In some embodiments, the thickness of the first connecting portion 110 is greater than the thickness of the second connecting portion 120. The thickness of the first connecting portion 110 is relatively thick, thereby making the main portion of the positive electrode current collecting disc thicker. This facilitates forming the first connecting portion 110 and the second connecting portion 120 directly on the positive electrode current collecting disc, thereby preventing the positive electrode current collecting disc from breaking during the forming process. It also prevents the first connecting portion 110 from affecting the electrode core 320 when welding to the electrode post 250, thereby extending the service life of the electrode core 320.

[0140] At the same time, by setting the thickness of the first connecting part 110 to be greater than the thickness of the second connecting part 120, it is also beneficial to set the thickness of the second connecting part 120 to be thinner, which facilitates the welding of the second connecting part 120 and the pole core 320 and increases the welding yield.

[0141] Optionally, as shown in FIG14 , the thickness L1 of the second connecting portion 120 is 0.1 mm to 0.8 mm. A thinner thickness of the second connecting portion 120 reduces the structural strength of the second connecting portion 120 , making the positive electrode current collector disk more susceptible to breakage and shortening its service life. A thicker thickness of the second connecting portion 120 increases the difficulty of welding the second connecting portion 120 to the electrode core 320 .

[0142] Therefore, the present application sets the thickness L1 of the second connecting portion 120 to 0.1 mm to 0.8 mm, which can avoid the positive electrode current collecting disk from breaking while facilitating the welding of the second connecting portion 120 and the pole core 320 and increasing the welding yield.

[0143] 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.

[0144] Optionally, as shown in FIG14 , the thickness of the first connecting portion 110 is L2, where 0 mm < L2 - L1 ≤ 0.5 mm. That is, the thickness of the first connecting portion 110 is greater than the thickness of the second connecting portion 120, and the difference in thickness between the first connecting portion 110 and the second connecting portion 120 is less than 0.5 mm. This prevents the second connecting portion 120 from being too thick, thereby preventing portions of the disc body 140 from effectively protruding toward the electrode core 320 to form the second connecting portion 120. This reduces the difficulty of forming the positive electrode current collector disc, while also reducing its weight and production cost.

[0145] 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.

[0146] In some embodiments, as shown in Figures 15 and 16, the negative electrode current collecting plate includes a first connecting portion 110, an intermediate portion 130 and a second connecting portion 120. The first connecting portion 110, the intermediate portion 130 and the second connecting portion 120 are stacked in the axial direction of the pole core 320. The first connecting portion 110 is electrically connected to the pole column 250, and the second connecting portion 120 is electrically connected to the pole ear 321. Among them, the axial direction of the pole core 320 mentioned here can also be understood as the up and down direction shown in Figure 13. 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, it is convenient to use the negative electrode collecting plate to connect the two structural members (such as the pole 250 and the pole core 320) arranged in the up and down directions, thereby reducing the difficulty of connecting the pole 250 and the pole core 320 spaced apart in the up and down 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 draw out 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.

[0147] 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 collecting plate 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.

[0148] In some embodiments, during the processing of the negative electrode current collector disc, the negative electrode current collector disc is first formed into the shape of Figure 15. After the processing of the negative electrode current collector disc is completed, the negative electrode current collector disc is folded (as shown in Figure 16), so that the first connecting portion 110, the middle portion 130 and the second connecting portion 120 of the negative electrode collector disc are stacked in the axial direction of the pole core 320, which facilitates the use of the negative electrode current collector disc 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 disc, and reduces the difficulty of forming the negative electrode collector disc.

[0149] In some embodiments, as shown in Figures 14 and 15, the battery cell 1000 also includes a negative electrode cover plate 260. The negative electrode cover plate 260 and the cover plate 210 are arranged on opposite sides of the pole core 320. 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 facilitate the use of the negative electrode cover plate 260 to draw out the current of the pole core 320 to ensure the working performance of the pole core 320.

[0150] It is worth noting that the above arrangement enables the battery cell 1000 to adopt a single- and double-layer current collecting disc design, which is beneficial for reducing impedance and improving the space utilization and process feasibility of the battery cell 1000.

[0151] In some embodiments, the positive electrode current collecting disc is made of aluminum, and the negative electrode current collecting disc is made of copper.

[0152] 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. No specific limitation is made here.

[0153] In some embodiments, as shown in Figures 15 and 16 , when the current collecting tray 100 includes a first connecting portion 110, a middle portion 130, and a second connecting portion 120, the second connecting portion 120 further includes an identification area 122, which is disposed near the connection between the middle portion 130 and the second connecting portion 120. In other words, the identification area 122 is disposed near the connection between the middle portion 130 and the second connecting portion 120. The identification area 122 helps a worker quickly locate the connection between the middle portion 130 and the second connecting portion 120, thereby facilitating folding the current collecting tray 100 from the shape shown in Figure 15 to the shape shown in Figure 16 , reducing the molding difficulty of the current collecting tray 100 and ensuring the structural accuracy of the molded current collecting tray 100, thereby avoiding reducing the area of ​​the second connecting portion 120, thereby ensuring the connection area between the current collecting tray 100 and the pole core 320, and improving the operating performance of the battery cell 1000.

[0154] That is, by providing the identification area 122 , the present application can reduce the difficulty of forming the collecting disc 100 while limiting the folding position of the collecting disc 100 to ensure the connection area between the second connecting portion 120 and the pole core 320 .

[0155] In some embodiments, as shown in FIG16 , the line connecting the opposite sidewalls of the middle portion 130 and the connection point of the second connecting portion 120 is a first connecting line T1, and the minimum distance between the marking area 122 and the first connecting line T1 ranges from -2 mm to +2 mm. It can also be understood that the line connecting the middle portion 130 and the second connecting portion 120 is the first connecting line T1, and there are multiple distances between the marking area 122 and the first connecting line T1, the minimum of which ranges from -2 mm to +2 mm. The minimum distance between the marking area 122 and the first connecting line T1 can also be understood as T2 shown in FIG16 .

[0156] 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.

[0157] 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 part 120 and the pole core 320, and at the same time ensuring the area of ​​the middle part 130, so that the first connecting part 110, the middle part 130 and the second connecting part 120 can be effectively stacked in the axial direction of the pole core 320, thereby ensuring the performance of the collecting plate 100.

[0158] 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.

[0159] Optionally, as shown in FIG15 , the maximum width of the identification area 122 is D3, and the minimum width of the middle portion 130 is D4, where 0.2<D3 / D4<1. In other words, the maximum width of the identification area 122 is less than the minimum width of the middle portion 130, and the ratio of the maximum width of the identification area 122 to the minimum width of the middle portion 130 is greater than 0.2. This prevents the structural strength of the collector tray 100 from being reduced by the provision of the identification area 122 while ensuring that the identification area 122 has a certain width. This facilitates the use of the identification area 122 to limit the folding position of the collector tray 100, thereby reducing the difficulty of forming the collector tray 100.

[0160] 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.

[0161] In some embodiments, as shown in Figures 15 and 16 , the identification area 122 is a through hole extending through the second connecting portion 120 or a groove provided in the second connecting portion 120. In other words, the identification area 122 can be formed as a through hole extending through the second connecting portion 120 or as a groove provided in the second connecting portion 120. There is no specific limitation here, as long as the position of the identification area 122 can be visually observed by the operator so that the identification area 122 can be used to determine the folding position of the collecting tray 100.

[0162] 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.

[0163] In some embodiments, as shown in FIG13 and FIG14 , the battery cell 1000 is a cylindrical battery, so that the battery cell 1000 has advantages such as high capacity, long cycle life, and wide operating temperature range, thereby ensuring the working performance of the battery cell 1000.

[0164] The battery assembly 3000 according to an embodiment of the present application is described below.

[0165] 17 , a battery assembly 3000 according to an embodiment of the present application includes: a plurality of battery cells 1000 .

[0166] 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.

[0167] As can be seen from the above structure, the battery assembly 3000 of the embodiment of the present application, by adopting the aforementioned battery cells 1000, can ensure the connection quality between the multiple battery cells 1000 and ensure the working performance of the battery assembly 3000.

[0168] It should be noted that the battery assembly 3000 mentioned here can be a battery pack or a battery module.

[0169] The following describes the electric device 4000 according to an embodiment of the present application.

[0170] 18 , an electric device 4000 according to an embodiment of the present application includes a battery assembly 3000 .

[0171] The battery assembly 3000 is the aforementioned battery assembly, and the specific structure of the battery assembly 3000 is not described in detail here.

[0172] As can be seen from the above structure, the electrical device 4000 of the embodiment of the present application improves the working performance of the electrical device 4000 by adopting the aforementioned battery assembly 3000.

[0173] It should be noted that the electrical device 4000 mentioned here can be but is not limited to a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc.

[0174] 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.

[0175] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installation" and "connection" should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; they can refer to mechanical connection or electrical connection. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0176] The specific structures of the pole assembly 200 of the battery cell 1000 according to the embodiment of the present application, the battery cell 1000, the battery assembly 3000 and other components of the electrical device 4000, such as the pole core 320, are well known to those skilled in the art and will not be described in detail here.

[0177] Throughout this specification, references to terms such as "embodiment" and "example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0178] Although the embodiments of the present application 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 intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell (1000) pole assembly (200), characterized in that: include: A pole (250), wherein a liquid injection channel (211) is provided in the pole (250); A sealing cover (230) includes a main body (231) and a connecting protrusion (232), the main body (231) and the pole (250) being welded together to block the injection channel (211), a weld (290) being formed at the connection between the main body (231) and the pole (250), the connecting protrusion (232) being provided on a first end face (2311) of the main body (231) in a thickness direction away from the injection channel (211), the connecting protrusion (232) being suitable for connection with a busbar (2000), the connecting protrusion (232) protruding from the main body (231) to form a step for accommodating the weld (290), so that the protruding 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).

2. The battery cell (1000) terminal assembly (200) according to claim 1, characterized in that: In the thickness direction of the main body (231), the connecting protrusion (232) protrudes in a direction away from the injection channel (211) and protrudes from the pole (250).

3. The battery cell (1000) terminal assembly (200) according to claim 1, characterized in that: 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 orthographic projection of the connecting protrusion (232) in the thickness direction of the sealing cover (230) at least partially overlap, and the second end face (234) is provided with a thinning groove (2341) at least partially arranged opposite to the connecting protrusion (232).

4. The battery cell (1000) terminal assembly (200) according to claim 3, characterized in that: The groove depth of the thinning groove (2341) is greater than or equal to the protrusion height of the connecting protrusion (232).

5. The battery cell (1000) terminal assembly (200) according to claim 4, characterized in that: The thinning groove (2341) is spaced apart from the outer peripheral wall of the main body (231), and the minimum spacing ranges from 0.8 mm to 3.6 mm.

6. The electrode assembly (200) of the battery cell (1000) according to any one of claims 1 to 5, characterized in that: The main body (231) includes a connected sealing portion (2312) and a lap portion (2313), wherein the sealing portion (2312) is located in the injection channel (211), and the lap portion (2313) is provided on at least a portion of the outer periphery of the sealing portion (2312). The lap portion (2313) is placed on the end face (251) of the pole (250) and is welded to the pole (250).

7. The battery cell (1000) terminal assembly (200) according to claim 6, characterized in that: In the thickness direction of the sealing cover (230), a portion of the orthographic projection of the connecting protrusion (232) coincides with the orthographic projection of the overlapping portion (2313).

8. The battery cell (1000) terminal assembly (200) according to claim 6, characterized in that: The thickness of the overlapping portion (2313) ranges from 0.3 mm to 1 mm.

9. The battery cell (1000) terminal assembly (200) according to claim 6, characterized in that: The thickness of the blocking portion (2312) is greater than the protrusion height of the connecting protrusion (232).

10. The electrode assembly (200) of the battery cell (1000) according to any one of claims 1 to 9, characterized in that: The inner wall of the injection channel (211) is provided with a groove (2111), the groove (2111) extends to the end surface (251) of the pole (250), the side wall of the groove (2111) defines a support surface (2112), the main body (231) is supported on the support surface (2112), and the outer peripheral wall of the main body (231) and the inner peripheral wall of the groove (2111) are welded together.

11. The battery cell (1000) terminal assembly (200) according to claim 10, characterized in that: The first end surface (2311) (251) protrudes from the end surface (251) of the pole (250).

12. The battery cell (1000) terminal assembly (200) according to claim 11, characterized in that: The distance between the first end face (2311) and the end face (251) of the pole (250) has a value ranging from 0.05 mm to 1 mm.

13. The battery cell (1000) terminal assembly (200) according to claim 10, characterized in that: A first chamfer (213) is provided between the groove (2111) and the end face (251) of the pole (250), a second chamfer (235) is provided between the outer peripheral wall of the main body (231) and the first end face (2311), the first chamfer (213) and the second chamfer (235) are arranged at intervals, and solder is provided between the first chamfer (213) and the second chamfer (235).

14. The battery cell (1000) terminal assembly (200) according to claim 10, characterized in that: The inner peripheral 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 peripheral wall of the main body (231) is adapted to the inner peripheral wall of the groove (2111).

15. The battery cell (1000) terminal assembly (200) according to claim 14, characterized in that: The angle between the inner peripheral wall of the groove (2111) and the supporting surface (2112) is a, wherein 90°<a≤150°.

16. The electrode assembly (200) of the battery cell (1000) according to any one of claims 1 to 15, characterized in that: The pole (250) comprises a bottom plate (2113) and a side plate (2119), wherein 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 the injection channel (211), and the bottom plate (2113) is provided with an injection hole (2114) connected to the injection channel (211), and a sealing member (220) is provided at the injection hole (2114) for sealing it, and the bottom plate (2113) is suitable for being electrically connected to the pole core (320).

17. A battery cell (1000), characterized in that: include: a housing (300), wherein the housing (300) forms a receiving cavity (310); A pole core (320), the pole core (320) being disposed in the accommodating cavity (310) and having a pole ear (321); A pole assembly (200), wherein the pole assembly (200) is the pole assembly (200) according to any one of claims 1 to 16, the pole assembly (200) is insulated and connected to the housing (300), and the pole lug (321) is electrically connected to the pole assembly (200).

18. The battery cell (1000) according to claim 17, characterized in that Also includes: A current collecting disk (100) is provided between the pole core (320) and the pole assembly (200), and is electrically connected to the pole lug (321) and the pole (250) of the pole assembly (200), respectively.

19. A battery assembly (3000), characterized in that: The battery comprises a plurality of battery cells (1000) according to claim 17 or 18.

20. An electrical device (4000), characterized in that: Comprising the battery assembly (3000) according to claim 19.

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