Terminal post assembly of battery cell, battery cell, battery assembly, and electric device

Abstract

Provided in the present application are a terminal post assembly of a battery cell, a battery cell, a battery assembly, and an electric device. The terminal post assembly of a battery cell comprises a terminal post, wherein an electrolyte injection channel is provided in the terminal post and has an electrolyte outlet; the terminal post comprises a protruding portion, which is arranged around the electrolyte outlet; and a blocking channel that communicates with the electrolyte injection channel is formed in the protruding portion. In the terminal post assembly of a battery cell in the embodiments of the present application, by means of providing the protruding portion that surrounds the electrolyte outlet and forming in the protruding portion the blocking channel that communicates with the electrolyte injection channel, an electrolyte in the battery cell can be prevented, to a certain extent, from flowing back to the electrolyte injection channel through the electrolyte outlet, thereby ensuring the electrolyte injection performance of the terminal post assembly, and thus improving the working performance of the battery cell.

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 202410371309.5 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 in particular to a battery cell pole assembly, a battery cell, a battery assembly, and an electrical device. Background Art

[0003] In the prior art, in order to facilitate liquid injection toward the electrode core after the battery cell is assembled, a liquid injection hole is usually provided on the electrode of the electrode assembly of the battery cell.

[0004] However, in order to enable penetration welding with the current collecting plate, the base plate of the existing pole is usually set as thin as possible, and the injection hole is opened on the base plate, which easily causes electrolyte leakage due to backflow through the injection hole, affecting the working performance of the battery cell.

[0005] Summary of the Invention

[0006] This application aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of this application is to provide a battery cell terminal assembly that can, to a certain extent, prevent electrolyte backflow through the injection hole, thereby ensuring the injection effect and solving the technical problem of electrolyte backflow through the injection hole in the prior art.

[0007] A second objective of the present application is to provide a battery cell having the above-mentioned electrode assembly.

[0008] The third objective of the present application is to provide a battery assembly having the above-mentioned battery cell.

[0009] The fourth objective of the present application is to provide an electrical device having the above-mentioned battery assembly.

[0010] According to an embodiment of the present application, the electrode assembly of the battery cell includes: a electrode, a liquid injection channel is provided in the electrode, the liquid injection channel has a liquid outlet, the electrode includes a protrusion, the protrusion is arranged around the liquid outlet, and a blocking channel connected to the liquid injection channel is formed in the protrusion.

[0011] According to the electrode assembly of the battery cell of the embodiment of the present application, a protrusion is provided around the liquid outlet and a blocking channel connected to the injection channel is formed in the protrusion. The protrusion can be used to extend the flow path of the electrolyte entering the injection channel through the liquid outlet, thereby preventing the electrolyte from flowing back into the injection channel through the liquid outlet to a certain extent, avoiding electrolyte leakage, ensuring the injection effect of the electrode assembly, and improving the working performance of the battery cell.

[0012] In some embodiments, the pole has 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 an injection channel, at least a portion of the bottom plate is opposite to the injection channel, the liquid outlet and the protrusion are both provided on the bottom plate, and the bottom plate is suitable for being electrically connected to the pole core.

[0013] In some embodiments, the protrusion is provided on a first end surface of the bottom plate facing away from the liquid injection channel.

[0014] In some embodiments, the protrusion protrudes in a direction away from the injection channel, and the protrusion height of the protrusion ranges from 0.75 mm to 2 mm; and / or the minimum thickness of the bottom plate ranges from 0.2 mm to 0.8 mm.

[0015] In some embodiments, the minimum diameter of the liquid outlet and / or the blocking channel ranges from 1 mm to 6 mm.

[0016] In some embodiments, the bottom plate has a second end surface facing the liquid injection channel, and a transition chamfer is provided between the liquid outlet and the second end surface.

[0017] In some embodiments, the transition chamfer is a straight chamfer, the axial width of the straight chamfer is in the range of 0.1 mm to 0.8 mm, and the radial width of the straight chamfer is in the range of 0.05 mm to 0.8 mm.

[0018] In some embodiments, the transition chamfer is a round chamfer, and the radius of the round chamfer is in the range of 0.05 mm to 0.8 mm.

[0019] In some embodiments, the pole assembly further includes a sealing nail, which is disposed at the liquid outlet to seal the liquid outlet.

[0020] In some embodiments, the pole assembly further includes a sealing cover, which is disposed at an end of the side plate away from the bottom plate to seal the inlet end of the liquid injection channel.

[0021] In some embodiments, the sealing cover includes a main body and a connecting protrusion. The main body is welded to the pole to seal the inlet end. A weld is formed at the connection between the main body and the pole. The connecting protrusion is provided on the third end face of the main body in the thickness direction away from the injection channel. The connecting protrusion is suitable for connection to the bus. The protrusion height of the connecting protrusion is greater than or equal to the maximum height of the weld protruding from the third end face.

[0022] In some embodiments, in the thickness direction of the body portion, the connecting protrusion protrudes in a direction away from the injection channel and protrudes from the pole.

[0023] 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, the overlapping portion is placed on the end face of the pole and is welded to the pole; 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.

[0024] In some embodiments, the thickness of the overlapping portion ranges from 0.3 mm to 1 mm.

[0025] In some embodiments, the thickness of the blocking portion is greater than the height of the connecting protrusion.

[0026] In some embodiments, the inner wall of the injection channel is provided with a groove, which extends to the end face of the pole, and 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 together.

[0027] In some embodiments, the third end surface protrudes from the end surface of the pole.

[0028] In some embodiments, the distance between the third end face and the end face of the pole is in the range of 0.05 mm to 1 mm.

[0029] 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 third end face, the first chamfer and the second chamfer are spaced apart, and solder is provided between the first chamfer and the second chamfer.

[0030] According to the battery cell of the embodiment of the present application, it includes: a shell, which forms a accommodating cavity with an opening; a pole core, which is arranged in the accommodating cavity and has a pole ear; a pole assembly, which is the aforementioned pole assembly and is arranged at the opening; and a current collecting plate, which is arranged between the pole core and the pole assembly and is electrically connected to the pole ear and the pole assembly respectively.

[0031] According to the battery cell of the embodiment of the present application, the operating performance of the battery cell can be guaranteed by adopting the aforementioned terminal assembly.

[0032] In some embodiments, the battery cells are cylindrical batteries.

[0033] The battery assembly according to the embodiment of the present application includes a plurality of the aforementioned battery cells.

[0034] According to the battery assembly of the embodiment of the present application, the operating performance of the battery assembly is guaranteed by adopting the aforementioned battery cells.

[0035] An electrical device according to an embodiment of the present application includes the aforementioned battery assembly.

[0036] According to the electric device of the embodiment of the present application, the operating performance of the electric device is guaranteed by adopting the aforementioned battery assembly.

[0037] Additional aspects and advantages of the present application will become apparent from the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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:

[0039] FIG1 is a partial cross-sectional view of a battery cell according to some embodiments of the first aspect of the present application.

[0040] FIG2 is a schematic diagram of a pole according to some embodiments of the present application.

[0041] FIG3 is a cross-sectional view of a pole according to some embodiments of the present application.

[0042] FIG4 is a cross-sectional view of a pole according to some other embodiments of the present application.

[0043] FIG5 is a cross-sectional view of the sealing cover of some embodiments of the first aspect of the present application.

[0044] FIG6 is a partial cross-sectional view of a battery cell connected to a bus bar in some embodiments of the first aspect of the present application.

[0045] FIG7 is a partial cross-sectional view of a battery cell according to some embodiments of the second aspect of the present application.

[0046] FIG8 is a partial enlarged view of area I in FIG7 .

[0047] FIG9 is a schematic diagram of a sealing cover according to some embodiments of the second aspect of the present application.

[0048] FIG10 is a cross-sectional view of a sealing cover according to some embodiments of the second aspect of the present application.

[0049] FIG11 is a schematic diagram of a sealing cover according to some embodiments of the third aspect of the present application.

[0050] FIG12 is a cross-sectional view of a sealing cover of some embodiments of the third aspect of the present application.

[0051] FIG13 is a partial cross-sectional view of a battery cell according to some embodiments of the third aspect of the present application.

[0052] FIG14 is a schematic diagram of a battery cell according to some embodiments of the present application.

[0053] FIG15 is an exploded view of a battery cell according to some embodiments of the present application.

[0054] FIG. 16 is a schematic diagram of a current collecting plate according to some embodiments of the present application.

[0055] FIG17 is a schematic diagram of the current collecting disk and the negative electrode cover plate in some other embodiments of the present application, wherein the current collecting disk is in an unfolded state.

[0056] FIG18 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.

[0057] FIG19 is a schematic diagram of a battery assembly according to some embodiments of the present application.

[0058] FIG20 is a schematic diagram of an electrical device according to some embodiments of the present application.

[0059] Reference numerals:

[0060] 1. Electrical device; 10. Battery assembly; 1000. Battery cell; 200. Terminal assembly; 250. Terminal; 211. Liquid injection channel; 2111. Groove; 2112. Support surface; 2113. Bottom plate; 2114. Liquid outlet; 2115. First end surface; 2116. Second end surface; 2117. Transition chamfer; 2118. Inlet end; 2119. Side plate; 212. Protrusion; 2121. Blocking channel; 213. First chamfer; 251. End surface; 220. Sealing pin; 230. Sealing cover; 231. Main body; 2311. Third end surface; 2312. Blocking portion; 23 13. Overlapping portion; 232. Connecting protrusion; 235. Second chamfer; 234. Fourth end face; 2341. Thinning groove; 210. Cover plate; 260. Negative electrode cover plate; 270. Top spacer; 290. Weld; 400. Insulator; 430. Insulator sheet; 440. Sealing ring; 500. Buffer; 800. Protective sheet; 100. Collecting plate; 110. First connecting portion; 120. Second connecting portion; 122. Identification area; 130. Middle portion; 140. Plate body; 300. Shell; 310. Accommodating cavity; 311. Opening; 320. Pole core; 321. Pole ear; 2000. Busbar. Specific embodiments

[0061] 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.

[0062] 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.

[0063] It should be noted that, in the prior art, in order to ensure the working performance of the pole 250, it is usually necessary to perform penetration welding on the pole 250 and the current collecting plate 100 (the specific structure of the current collecting plate 100 can be seen in Figure 15), and in order to ensure the welding effect of the penetration welding, it is also necessary to set the bottom plate 2113 of the pole 250 as thin as possible. However, when the liquid outlet 2114 of the injection channel 211 is opened on the thinner bottom plate 2113, the electrolyte can easily flow back to the injection channel 211 through the liquid outlet 2114, causing electrolyte leakage, affecting the injection effect of the battery cell 1000, and thus reducing the working performance of the battery cell 1000.

[0064] To solve the above problems, the present application proposes a terminal assembly 200 for a battery cell 1000 .

[0065] 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.

[0066] As shown in FIG. 1 , a terminal assembly 200 of a battery cell 1000 according to an embodiment of the present application includes a terminal 250 .

[0067] 1 , 2 and 3 , a liquid injection channel 211 is provided in the pole 250 , and the liquid injection channel 211 has a liquid outlet 2114 . The pole 250 includes a protrusion 212 , which is arranged around the liquid outlet 2114 , and a blocking channel 2121 connected to the liquid injection channel 211 is formed in the protrusion 212 .

[0068] It should be noted that by setting the injection channel 211 to have a liquid outlet 2114, it can be ensured that the electrolyte flowing into the injection channel 211 can be discharged smoothly, thereby facilitating the injection of liquid into the pole core 320 (the specific structure of the pole core 320 can be seen in Figures 1 and 15), reducing the difficulty of injection.

[0069] At the same time, by configuring the pole 250 to include a protrusion 212 arranged around the liquid outlet 2114 and forming a blocking channel 2121 connected to the injection channel 211 in the protrusion 212, when the electrolyte in the injection channel 211 enters through the liquid outlet 2114, it needs to flow through the blocking channel 2121. Since the blocking channel 2121 has a certain extension length, it is convenient to extend the flow path of the electrolyte entering the injection channel 211 through the liquid outlet 2114. In this way, it can prevent the electrolyte from flowing back to the injection channel 211 through the liquid outlet 2114 to a certain extent, avoid electrolyte leakage, and ensure the working performance of the battery cell 1000.

[0070] In some embodiments, the pole 250 is formed as a hollow member to define the injection channel 211 , thereby reducing the difficulty of molding the injection channel 211 .

[0071] 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, by providing a protrusion 212 surrounding the liquid outlet 2114 and forming a blocking channel 2121 connected to the injection channel 211 in the protrusion 212, can to a certain extent solve the problem that the electrolyte is easy to flow back to the injection channel 211 through the liquid outlet 2114, thereby improving the injection effect of the pole assembly 200 and ensuring the working performance of the battery cell 1000.

[0072] It can be understood that, compared with the prior art, the present application can, to a certain extent, prevent the electrolyte from flowing back to the injection channel 211 through the liquid outlet 2114 .

[0073] In some embodiments, as shown in Figure 2, the pole 250 has 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, at least a portion of the bottom plate 2113 is opposite to the injection channel 211, the liquid outlet 2114 and the protrusion 212 are both provided on the bottom plate 2113, and the bottom plate 2113 is suitable for being electrically connected to the pole core 320. Among them, by configuring the pole 250 to include a bottom plate 2113 and a side plate 2119, and utilizing the bottom plate 2113 and the side plate 2119 to cooperate to define the liquid injection channel 211, the difficulty of forming the liquid injection channel 211 can be reduced, thereby reducing the difficulty of injecting liquid into the battery cell 1000; by at least a portion of the bottom plate 2113 being opposite the liquid injection channel 211, and the liquid outlet 2114 and the protrusion 212 are both provided on the bottom plate 2113, it can be ensured that the liquid outlet 2114 can be connected to the liquid injection channel 211, and it is convenient to configure the protrusion 212 around the liquid outlet 2114, so as to facilitate the use of the protrusion 212 to extend the flow path of the electrolyte entering the liquid injection channel 211 through the liquid outlet 2114, to a certain extent, to avoid the electrolyte from flowing back to the liquid injection channel 211 through the liquid outlet 2114, thereby avoiding electrolyte leakage and ensuring the working performance of the battery cell 1000.

[0074] 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.

[0075] It should be noted that, at the same time, since the present application utilizes the protrusion 212 to solve the problem of electrolyte backflow, the thickness of the bottom plate 2113 can be adaptively reduced so that the thickness of the bottom plate 2113 is as thin as possible, thereby reducing the difficulty of electrical connection between the pole 250 and the pole core 320, and ensuring the connection quality, thereby ensuring the working performance of the pole 250.

[0076] That is to say, the present application provides a protrusion 212 surrounding the liquid outlet 2114, and forms a blocking channel 2121 connected to the injection channel 211 in the protrusion 212. In this way, while preventing the electrolyte from flowing back to the injection channel 211 through the liquid outlet 2114, it can also facilitate reducing the thickness of the bottom plate 2113 of the pole 250, thereby reducing the difficulty of electrical connection between the pole 250 and the pole core 320, and ensuring the connection quality, thereby ensuring the working performance of the pole 250.

[0077] In some embodiments, a current collecting plate 100 is provided between the base plate 2113 and the pole core 320 (the specific structure of the current collecting plate 100 can be seen in Figure 15), and the current collecting plate 100 is welded to the base plate 2113 and the pole core 320 respectively, thereby realizing electrical connection between the base plate 2113 and the pole core 320, reducing the difficulty of electrical connection between the base plate 2113 and the pole core 320.

[0078] Therefore, after reducing the thickness of the bottom plate 2113 of the pole 250, the present application can reduce the difficulty of welding the pole 250 and the collecting plate 100 and ensure the welding quality, thereby ensuring the connection quality between the bottom plate 2113 and the pole core 320 and improving the working performance of the pole 250.

[0079] Optionally, the pole 250 is made of aluminum, the aluminum is connected to the collecting plate 100, 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.

[0080] In some embodiments, the pole 250 is formed by pressing to reduce the difficulty of forming the pole 250 .

[0081] In some embodiments, as shown in conjunction with Figures 1, 3, and 4, the protrusion 212 is provided on a first end surface 2115 of the bottom plate 2113 that is away from the injection channel 211. This means that the bottom plate 2113 has a first end surface 2115 that is away from the injection channel 211, and the protrusion 212 is provided on the first end surface 2115. This facilitates the flow path of the electrolyte entering the injection channel 211 through the liquid outlet 2114 by utilizing the protrusion 212, while also allowing the injection channel 211 to bulge toward the pole core 320, thereby facilitating the guidance of the electrolyte flowing through the injection channel 211 so that the electrolyte can effectively flow toward the pole core 320, thereby ensuring the injection effect and thus the working performance of the pole core 320.

[0082] That is to say, the protrusion 212 of the present application can not only prevent the electrolyte from flowing back through the liquid outlet 2114, but also guide the flow direction of the electrolyte to ensure the injection effect.

[0083] At the same time, by setting the protrusion 212, the material flow area can be increased, thereby ensuring that during the processing and forming process of the pole 250, part of the structure of the pole 250 can be deformed along the protruding direction of the protrusion 212, so as to reduce the processing difficulty of the pole 250 and improve the feasibility of the processing technology of the pole 250.

[0084] It should also be noted that the present application defines an injection channel 211 in the pole 250 and arranges the protrusion 212 on the first end face 2115 of the bottom plate 2113 facing away from the injection channel 211. In this way, when the pole core 320 is formed into a cylinder, it can be ensured that the liquid outlet 2114 of the injection channel 211 can be arranged directly opposite the winding hole of the pole core 320, thereby further ensuring the injection effect.

[0085] In some embodiments, as shown in FIG1 , FIG3 , and FIG4 , the protrusion 212 protrudes in a direction away from the injection channel 211 , and the protrusion height of the protrusion 212 ranges from 0.75 mm to 2 mm. The protrusion height of the protrusion 212 mentioned herein can be understood as L3 shown in FIG3 and FIG4 . When the protrusion height of the protrusion 212 is small, the extension length of the blocking channel 2121 is shortened, thereby affecting the diversion effect of the protrusion 212 and easily causing the electrolyte to flow back into the injection channel 211 through the liquid outlet 2114 . When the protrusion height of the protrusion 212 is large, on the one hand, the thickness of the terminal assembly 200 is increased, making the assembly of the terminal assembly 200 more difficult. On the other hand, when sealing the liquid outlet 2114, the contact area between the seal and the protrusion 212 is increased, thereby increasing friction and making it difficult for the seal to seal.

[0086] Therefore, the present application sets the value range of the protrusion height L3 of the protrusion 212 to 0.75mm-2mm. In this way, while ensuring the diversion effect of the protrusion 212 and avoiding the electrolyte from flowing back to the injection channel 211 through the liquid outlet 2114, it can also reduce the thickness of the pole assembly 200, reduce the assembly difficulty of the pole assembly 200, and reduce the difficulty of sealing the liquid outlet 2114.

[0087] In a specific example, the protrusion height of the protrusion 212 is 0.75 mm, 1 mm, 1.5 mm, or 2 mm.

[0088] Optionally, the minimum thickness of the bottom plate 2113 ranges from 0.2 mm to 0.8 mm. The minimum thickness of the bottom plate 2113 mentioned here can be understood as L4 shown in Figures 3 and 4. When the minimum thickness of the bottom plate 2113 is too small, the structural strength of the bottom plate 2113 is reduced, affecting the working performance of the bottom plate 2113. When the minimum thickness of the bottom plate 2113 is too large, the welding difficulty of the electrode 250 and the collecting plate 100 is increased, and the welding quality is reduced.

[0089] Therefore, the present application sets the minimum thickness range of the base plate 2113 to 0.2 mm-0.8 mm. In this way, while ensuring the structural strength of the base plate 2113, it can also reduce the difficulty of welding the pole 250 and the collecting plate 100, ensure the welding quality, and improve the welding yield of the pole 250 and the collecting plate 100.

[0090] In a specific example, the minimum thickness of the bottom plate 2113 is 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm, etc.

[0091] In some embodiments, the minimum diameter of the liquid outlet 2114 and / or the blocking channel 2121 is in the range of 1 mm to 6 mm. Here, it means that the minimum diameter of the liquid outlet 2114 is in the range of 1 mm to 6 mm; or, the minimum diameter of the blocking channel 2121 is in the range of 1 mm to 6 mm; or, the minimum diameter of the liquid outlet 2114 and the blocking channel 2121 is in the range of 1 mm to 6 mm. The minimum diameters of the liquid outlet 2114 and the blocking channel 2121 can be understood as shown in Figures 3 and 4. When the minimum diameter of the liquid outlet 2114 and / or the blocking channel 2121 is small, it will affect the liquid output of the liquid outlet 2114, thereby affecting the liquid injection effect. When the minimum diameter of the liquid outlet 2114 and / or the blocking channel 2121 is large, since the liquid outlet 2114 is arranged on the bottom plate 2113, the area of ​​the bottom plate 2113 will be reduced, thereby reducing the welding area between the pole 250 and the collecting plate 100, reducing the welding quality, and also affecting the flow capacity of the collecting plate 100.

[0092] Therefore, the present application sets the minimum diameter range of the liquid outlet 2114 and / or the blocking channel 2121 to 1mm-6mm. In this way, while ensuring the liquid output of the liquid outlet 2114 and improving the injection effect, the area of ​​the bottom plate 2113 can also be guaranteed, thereby ensuring the welding area between the pole 250 and the collecting plate 100, improving the welding quality, and improving the flow capacity of the collecting plate 100.

[0093] In a specific example, the minimum diameter of the liquid outlet 2114 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, etc.; the minimum diameter of the blocking channel 2121 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm.

[0094] In some embodiments, as shown in Figures 3 and 4, the bottom plate 2113 has a second end surface 2116 facing the liquid injection channel 211, and a transition chamfer 2117 is provided between the liquid outlet 2114 and the second end surface 2116. The transition chamfer 2117 can, on the one hand, reduce the resistance of the second end surface 2116 to the electrolyte, ensuring that the electrolyte in the liquid injection channel 211 can effectively flow to the liquid outlet 2114, thereby ensuring the liquid injection effect. On the other hand, it can also guide the sealing member (such as the sealing pin 220 described below) that seals the liquid outlet 2114, ensuring that the sealing member can be smoothly inserted into the liquid outlet 2114. At the same time, it can also prevent the angle between the liquid outlet 2114 and the second end surface 2116 from scratching the sealing member during the sealing process, thereby preventing some dust and foreign matter from being generated, thereby ensuring the sealing effect.

[0095] In some embodiments, as shown in FIG3 , the transition chamfer 2117 is a straight chamfer, and the axial width of the straight chamfer is in the range of 0.1 mm to 0.8 mm, and the radial width of the straight chamfer is in the range of 0.05 mm to 0.8 mm. The axial width of the straight chamfer mentioned here can be understood as L6 shown in FIG3 , and the radial width of the straight chamfer can be understood as L7 shown in FIG3 . When the axial width and radial width of the straight chamfer are small, the flow guiding effect of the transition chamfer 2117 will be reduced, and during the sealing process of the seal, there will be a phenomenon of scratching between the angle between the liquid outlet 2114 and the second end face 2116 and the seal. When the axial width and radial width of the straight chamfer are large, the area of ​​the second end face 2116 will be reduced, affecting the flow area of ​​the pole 250.

[0096] Therefore, the present application sets the value range of the axial width of the straight chamfer to 0.1mm-0.8mm and the value range of the radial width of the straight chamfer to 0.05mm-0.8mm. In this way, while ensuring the diversion effect of the transition chamfer 2117 and avoiding the angle between the liquid outlet 2114 and the second end face 2116 and the seal from scratching each other during the sealing process, it can also ensure the area of ​​the second end face 2116, thereby ensuring the flow area of ​​the pole 250.

[0097] In a specific example, the axial width of the straight chamfer 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, etc.; the radial width of the straight chamfer is 0.05 mm, 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, etc.

[0098] In some embodiments, as shown in FIG4 , the transition chamfer 2117 is a rounded chamfer, and the radius of the rounded chamfer is in the range of 0.05 mm to 0.8 mm. The radius of the rounded chamfer mentioned here can be understood as R shown in FIG4 . When the radius of the rounded chamfer is small, the flow guiding effect of the transition chamfer 2117 is reduced, and during the sealing process of the seal, there may be a phenomenon in which the angle between the liquid outlet 2114 and the second end face 2116 and the seal scratch each other. When the radius of the rounded chamfer is large, the area of ​​the second end face 2116 is reduced, affecting the flow area of ​​the pole 250.

[0099] Therefore, the present application sets the radius of the round chamfer to a range of 0.05mm-0.8mm. In this way, while ensuring the flow-guiding effect of the transition chamfer 2117 and avoiding the angle between the liquid outlet 2114 and the second end face 2116 and the seal from scratching each other during the sealing process, it can also ensure the area of ​​the second end face 2116, thereby ensuring the flow area of ​​the pole 250.

[0100] In a specific example, the radius of the fillet is 0.05 mm, 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, etc.

[0101] In some embodiments, as shown in FIG1 , the terminal assembly 200 further includes a sealing nail 220, which is disposed at the liquid outlet 2114 to seal the liquid outlet 2114. This prevents foreign matter from entering the battery cell 1000 through the liquid outlet 2114 of the injection channel 211, and also prevents the electrolyte in the battery cell 1000 from flowing back into the injection channel 211 through the liquid outlet 2114 of the injection channel 211, thereby ensuring the operating performance of the battery cell 1000.

[0102] In some embodiments, the sealing pin 220 is injection molded and sealed at the liquid outlet 2114 of the injection channel 211 . This not only achieves the purpose of sealing the injection channel 211 , but also reduces the difficulty of molding the sealing pin 220 .

[0103] In a specific example, after the liquid injection into the liquid injection channel 211 is completed, the sealing pin 220 is used to block the liquid outlet 2114 of the liquid injection channel 211 to achieve sealing of the liquid injection channel 211 .

[0104] It should be noted that, by providing a protrusion 212 surrounding the liquid outlet 2114, the present application can also guide the sealing pin 220 during the sealing process of the sealing pin 220, thereby reducing the difficulty of sealing. At the same time, the protrusion 212 can also be used to increase the contact area between the liquid outlet 2114 and the sealing pin 220 to ensure the sealing effect.

[0105] In summary, the present application sets a protrusion 212 surrounding the liquid outlet 2114. On the one hand, it can prevent the electrolyte from flowing back to the injection channel 211 through the liquid outlet 2114 to a certain extent, thereby avoiding electrolyte leakage and ensuring the working performance of the battery cell 1000; on the other hand, it is also beneficial to reduce the thickness of the bottom plate 2113, reduce the welding difficulty of the pole 250 and the collecting plate 100, and ensure the welding quality and welding yield; on the third hand, it can guide the electrolyte and the sealing nail 220 to ensure the injection effect and reduce the sealing difficulty of the sealing nail 220; on the fourth hand, it can also increase the contact area between the sealing nail 220 and the pole 250, thereby ensuring the sealing effect of the sealing nail 220.

[0106] In some embodiments, as shown in conjunction with FIG1 and FIG2 , the pole assembly 200 further includes a sealing cover 230, which is disposed at one end of the side plate 2119 away from the bottom plate 2113 to seal the inlet end 2118 of the injection channel 211. In other words, the present application not only provides a sealing nail 220 to seal the liquid outlet 2114 of the injection channel 211, but also provides a sealing cover 230 to seal the inlet end 2118 of the injection channel 211, thereby effectively ensuring the sealing effect of the injection channel 211. While preventing external foreign matter from entering the battery cell 1000 through the inlet end 2118 of the injection channel 211, it can also prevent the electrolyte in the battery cell 1000 from overflowing through the inlet end 2118 of the injection channel 211, thereby ensuring the working performance of the battery cell 1000.

[0107] In some embodiments, the sealing cover 230 is formed by stamping to reduce the difficulty of forming the sealing cover 230 .

[0108] In a specific example, after the injection of liquid into the injection channel 211 is completed, the liquid outlet 2114 of the injection channel 211 can be sealed with a sealing pin 220 first, and then the sealing cover 230 can be laser welded to the inlet end 2118 of the injection channel 211 to seal the injection channel 211.

[0109] At the same time, by using the sealing nail 220 to block the liquid outlet 2114 of the injection channel 211, 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.

[0110] In some embodiments, in combination with Figures 2, 3 and 4, the liquid outlet 2114 and the inlet end 2118 of the injection channel 211 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 liquid outlet 2114 is arranged close to the pole core 320, and the inlet end 2118 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.

[0111] In some embodiments, in combination with Figures 1, 5 and 6, 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 inlet end 2118. 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 third 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 protrusion height of the connecting protrusion 232 is greater than or equal to the maximum height of the weld 290 protruding from the third end face 2311. Here, it means that when the main body 231 and the pole 250 are welded together to block the inlet end 2118 of 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 7), the main body 231 has a third end face 2311 away from the injection channel 211, and the connecting protrusion 232 is provided on the third end face 2311 and the protrusion height of the connecting protrusion 232 (the connecting protrusion 23 5) is greater than or equal to the maximum height of the weld 290 protruding from the third 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.

[0112] 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 third 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 part of the weld 290 protrudes from the third end face 2311. At the same time, the weld 290 has multiple heights protruding from the third end face 2311, and the maximum height is less than the protrusion height of the connecting protrusion 232. 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.

[0113] That is to say, the present application effectively ensures the connection quality and stability between the sealing cover 230 and the bus 2000 by setting 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 maximum height of the weld 290 protruding from the third end face 2311.

[0114] 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.

[0115] In summary, the present application creatively sets the structure of the sealing cover 230 to ensure the basic area of ​​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.

[0116] Optionally, the protrusion height of the connecting protrusion 232 is greater than or equal to the weld reinforcement height between the sealing cover 230 and the pole 250. The protrusion height of the connecting protrusion 232 mentioned here can be understood as H4 shown in Figures 5 and 10. The weld reinforcement height refers to the height of the weld material protruding from the body portion 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 weld reinforcement height between the sealing cover 230 and the pole 250, the weld reinforcement height can be prevented from protruding from the connecting protrusion 232, thereby preventing the weld reinforcement height between the sealing cover 230 and the pole 250 from affecting the connection between the connecting protrusion 232 and the busbar 2000, further ensuring the connection quality between the connecting protrusion 232 and the busbar 2000 and improving the welding yield rate of the busbar 2000.

[0117] 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 10.

[0118] 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.

[0119] In some embodiments, as shown in Figures 1, 7, and 8, the connecting protrusion 232 protrudes in a direction away from the injection channel 211 along the thickness direction of the body 231 and protrudes beyond the terminal 250. This allows the connecting surface of the connecting protrusion 232 to be formed axially outward of the terminal 250, thereby preventing the terminal 250 from interfering with the connection between the connecting protrusion 232 and the busbar 2000, reducing the difficulty of connecting the sealing cover 230 to the busbar 2000, and ensuring the quality of the connection between the connecting protrusion 232 and the busbar 2000, thereby improving the welding yield of the busbar 2000.

[0120] In some embodiments, in combination with Figures 7, 9 and 10, the main body 231 is provided with a fourth end face 234 facing the injection channel 211 in the thickness direction, the fourth end face 234 and the positive projection of the connecting protrusion 232 in the thickness direction of the sealing cover 230 at least partially overlap, and the fourth 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 third end face 2311, but also has a fourth end face 234, and the fourth end face 234 is arranged toward the injection channel 211, so that in the thickness direction of the main body 231, the third end face 2311 and the fourth 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 fourth 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 fourth end face 234 is arranged opposite to the connecting protrusion 232, so that when the thinning groove 2341 is provided on the fourth end face 234 When the sealing cover 230 is connected to the pole 250, 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.

[0121] That is to say, the present application sets a connecting protrusion 232 on the third end face 2311 of the sealing cover 230, and sets a thinning groove 2341 on the fourth 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.

[0122] In the description of this application, features defined as "first", "second", "third" and "fourth" 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.

[0123] 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 10. 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.

[0124] 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.

[0125] In some embodiments, as shown in FIG. 10 , 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 10. 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.

[0126] 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.

[0127] 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.

[0128] In some embodiments, in combination with Figures 11, 12 and 13, the main body 231 includes a connected sealing portion 2312 and a lap portion 2313, the sealing portion 2312 is located in the injection channel 211, and the lap portion 2313 is arranged on at least a portion of the outer periphery of the sealing portion 2312, and 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 away from the pole core 320 in the thickness direction of the pole 250, or can be understood as the top surface 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 overlapping portion 2313 on the end face 251 of the pole 250 and welding it to the pole 250, the sealing cover 230 and the pole 250 are welded together. 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.

[0129] 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.

[0130] 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 .

[0131] In some embodiments, in combination with Figures 12 and 13, 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.

[0132] Optionally, as shown in FIG12 , 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 post 250 using the overlapping portion 2313, reduces the difficulty of assembling the sealing cover 230 and the terminal post 250, and improves the quality of the connection between the sealing cover 230 and the terminal post 250.

[0133] In some embodiments, as shown in Figure 12, 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.

[0134] 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 12, 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.

[0135] 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 FIG12 . When the thickness of 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 thickness of 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.

[0136] 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.

[0137] In some embodiments, the thickness of the overlapping portion 2313 is 0.3 mm, 0.5 mm, 0.8 mm, or 1 mm.

[0138] In some embodiments, as shown in FIG12 , 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 FIG12 . 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, thereby preventing the connecting protrusion 232 from being welded to the busbar 2000 and penetrating the sealing cover 230. In this way, while ensuring the sealing effect of the sealing cover 230, welding slag caused by the welding of the connecting protrusion 232 to the busbar 2000 can be prevented from flowing into the injection channel 211.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] In some embodiments, as shown in conjunction with Figures 1, 7, and 8, a groove 2111 is provided on the inner wall of the injection channel 211. The groove 2111 extends to the end face 251 of the electrode 250. The sidewall 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 that the welding of the body 231 and the electrode 250 is not limited to the body 231 being configured to include a blocking 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.

[0143] 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.

[0144] 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.

[0145] Optionally, as shown in FIG8 , in the radial direction of the pole 250, the outer peripheral wall of the connecting protrusion 232 is located radially inward of the outer peripheral wall of the body portion 231. 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.

[0146] In some embodiments, as shown in Figure 8, 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 and the pole 250 are welded, 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.

[0147] 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 5, 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.

[0148] In some embodiments, as shown in FIG8 , a first chamfer 213 is provided between the groove 2111 and the end face 251 of the terminal 250, and a second chamfer 235 is provided between the outer peripheral wall of the body 231 and the third end face 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.

[0149] 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.

[0150] It should be noted that FIG8 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 may also be formed as beveled corners, which is not specifically limited here.

[0151] In some embodiments, as shown in FIG8 , the third end face 2311 protrudes from the end face 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.

[0152] In some embodiments, the distance between the third end face 2311 and the end face 251 of the pole 250 is in the range of 0.05 mm to 1 mm. The distance between the third end face 2311 and the end face 251 of the pole 250 mentioned here can be understood as H3 shown in FIG8 . The above arrangement ensures that the third end face 2311 can protrude from the end face 251 of the pole 250 while also ensuring that the solder on the third 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.

[0153] Of course, in some other embodiments, when no chamfer is provided between the groove 2111 and the end face 251 of the pole 250 and between the outer peripheral wall of the main body 231 and the third end face 2311 (as shown in combination with Figures 1 and 5), the third 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 1 and 5, 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.

[0154] 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 third 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.

[0155] In some embodiments, as shown in FIG8 , 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. Specifically, 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.

[0156] 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.

[0157] In some embodiments, as shown in FIG8 , the angle a between the inner circumferential wall of the groove 2111 and the support surface 2112 is 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 welding between the sealing cover 230 and the terminal 250.

[0158] 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.

[0159] The battery cell 1000 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0160] As shown in FIG. 14 and FIG. 15 , a battery cell 1000 according to an embodiment of the present application includes: a housing 300 , a pole core 320 , a pole assembly 200 and a current collecting plate 100 .

[0161] The housing 300 forms an opening for a receiving cavity, and the electrode core 320 is disposed in the receiving cavity and has an electrode tab. Thus, the electrode core 320 is disposed within the housing 300 , making it easier to protect the electrode core 320 using the housing 300 , extending the service life of the electrode core 320 , and improving the safety of the electrode core 320 .

[0162] The pole assembly 200 is the aforementioned pole assembly 200 , and the specific structure of the pole assembly 200 is not described in detail here. The pole assembly 200 is provided at the opening.

[0163] The current collecting plate 100 is provided between the pole core 320 and the pole assembly 200 and is electrically connected to the pole tab and the pole assembly 200 respectively, thereby realizing the electrical connection between the pole core 320 and the pole 250, making it convenient to use the pole 250 to lead the current of the pole core 320 to ensure the working performance of the battery cell 1000.

[0164] In some embodiments, the collecting plate 100 is welded to the pole tab and the pole post 250 respectively. This allows the pole tab and the pole post 250 to form an electrical connection while ensuring the connection strength between the pole tab and the pole post 250, reducing the difficulty of connecting the pole tab and the pole post 250, and improving the assembly efficiency and structural stability of the battery cell 1000.

[0165] 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 liquid injection effect of the battery cell 1000, thereby ensuring the working performance of the battery cell 1000.

[0166] In some embodiments, the housing 300 is formed by stamping or welding, and the material of the housing 300 is aluminum or steel.

[0167] In some embodiments, as shown in FIG. 1 , the battery cell 1000 further 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 .

[0168] In some embodiments, as shown in Figures 1, 7 and 13, 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.

[0169] In some embodiments, as shown in Figures 1, 7 and 13, 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.

[0170] 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.

[0171] In some embodiments, as shown in Figures 1, 7, and 13, 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] In some embodiments, the battery cell 1000 further includes an explosion-proof valve, which is provided on the cover plate 210 . The explosion-proof valve is configured 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 .

[0176] In some embodiments, as shown in FIG14 , 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.

[0177] In some embodiments, as shown in Figures 1, 7 and 13, 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.

[0178] 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.

[0179] In some embodiments, as shown in Figures 15 and 16, 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, 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] Optionally, as shown in FIG16 , 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 .

[0185] 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.

[0186] 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.

[0187] Optionally, as shown in FIG16 , 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.

[0188] 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.

[0189] In some embodiments, as shown in Figures 17 and 18, 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 tab. 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 15. 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.

[0190] 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.

[0191] 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 17. After the processing of the negative electrode current collector disc is completed, the negative electrode current collector disc is folded (as shown in Figure 18), 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.

[0192] In some embodiments, as shown in Figures 15 and 17, 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 as 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.

[0193] 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.

[0194] In some embodiments, the positive electrode current collecting disc is made of aluminum, and the negative electrode current collecting disc is made of copper.

[0195] 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.

[0196] In some embodiments, as shown in Figures 17 and 18 , 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 17 to the shape shown in Figure 18 . This reduces the difficulty in molding the current collecting tray 100 and ensures the structural accuracy of the molded current collecting tray 100, thereby avoiding reducing the area of ​​the second connecting portion 120. This ensures a sufficient connection area between the current collecting tray 100 and the electrode core 320, thereby improving the operating performance of the battery cell 1000.

[0197] 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 .

[0198] In some embodiments, as shown in Figures 17 and 18 , 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.

[0199] 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.

[0200] In some embodiments, as shown in FIG14 and FIG15 , 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.

[0201] As shown in FIG. 19 , the battery assembly 10 according to an embodiment of the present application is described below.

[0202] A battery assembly 10 according to an embodiment of the present application includes: a plurality of battery cells 1000 .

[0203] 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.

[0204] As can be seen from the above structure, the battery assembly 10 of the embodiment of the present application adopts the aforementioned battery cell 1000 to ensure the working performance of the battery assembly 10.

[0205] It should be noted that the battery assembly 10 mentioned here can be a battery module or a battery pack.

[0206] As shown in FIG. 20 , the electric device 1 according to an embodiment of the present application is described below.

[0207] An electrical device 1 according to an embodiment of the present application includes: a battery assembly 10.

[0208] The battery assembly 10 is the aforementioned battery assembly 10 , and the specific structure of the battery assembly 10 is not described here in detail.

[0209] As can be seen from the above structure, the electrical device 1 of the embodiment of the present application adopts the aforementioned battery assembly 10 to ensure the working performance of the electrical device 1.

[0210] It should be noted that the electrical device 1 mentioned here can be but is not limited to a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.

[0211] 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.

[0212] 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.

[0213] The specific structures of the pole assembly 200 , the battery cell 1000 , the battery assembly 10 and other components of the electrical device 1 , such as the pole core 320 , of the battery cell 1000 according to the embodiment of the present application are well known to those skilled in the art and will not be described in detail here.

[0214] 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.

[0215] 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 pole assembly (200) of a battery cell (1000), wherein: include: A pole (250) is provided with a liquid injection channel (211) in the pole (250), the liquid injection channel (211) having a liquid outlet (2114), the pole (250) comprising a protrusion (212), the protrusion (212) being arranged around the liquid outlet (2114), and a blocking channel (2121) communicating with the liquid injection channel (211) being formed in the protrusion (212).

2. The battery cell (1000) terminal assembly (200) according to claim 1, wherein: 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), at least a portion of the bottom plate (2113) faces the injection channel (211), the liquid outlet (2114) and the protrusion (212) are both provided on the bottom plate (2113), and the bottom plate (2113) is suitable for being electrically connected to the pole core (320).

3. The battery cell (1000) terminal assembly (200) according to claim 2, wherein: The protruding portion (212) is provided on a first end surface (2115) of the bottom plate (2113) facing away from the liquid injection channel (211).

4. The battery cell (1000) terminal assembly (200) according to claim 2 or 3, wherein: The protrusion (212) protrudes in a direction away from the injection channel (211), and the protrusion height of the protrusion (212) ranges from 0.75 mm to 2 mm; And / or, the minimum thickness of the bottom plate (2113) ranges from 0.2 mm to 0.8 mm.

5. The electrode assembly (200) of the battery cell (1000) according to any one of claims 1 to 4, wherein: The minimum diameter of the liquid outlet (2114) and / or the blocking channel (2121) ranges from 1 mm to 6 mm.

6. The electrode assembly (200) of the battery cell (1000) according to any one of claims 2 to 5, wherein: The bottom plate (2113) has a second end surface (2116) facing the liquid injection channel (211), and a transition chamfer (2117) is provided between the liquid outlet (2114) and the second end surface (2116).

7. The battery cell (1000) terminal assembly (200) according to claim 6, wherein: The transition chamfer (2117) is a straight chamfer, the axial width of the straight chamfer has a value range of 0.1mm-0.8mm, and the radial width of the straight chamfer has a value range of 0.05mm-0.8mm.

8. The battery cell (1000) terminal assembly (200) according to claim 6, wherein: The transition chamfer (2117) is a round chamfer, and the radius of the round chamfer is in the range of 0.05mm-0.8mm.

9. The electrode assembly (200) of the battery cell (1000) according to any one of claims 1 to 8, wherein: It also includes a sealing nail (220), which is arranged at the liquid outlet (2114) to seal the liquid outlet (2114).

10. The electrode assembly (200) of the battery cell (1000) according to any one of claims 2 to 9, wherein: It also includes a sealing cover (230), which is arranged at an end of the side plate (2119) away from the bottom plate (2113) to seal the inlet end (2118) of the liquid injection channel (211).

11. The battery cell (1000) terminal assembly (200) according to claim 10, wherein: 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 inlet end (2118). 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 third 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 connection with the busbar (2000). The protrusion height of the connecting protrusion (232) is greater than or equal to the maximum height of the weld (290) protruding from the third end face (2311).

12. The battery cell (1000) terminal assembly (200) according to claim 11, wherein: 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).

13. The electrode assembly (200) of the battery cell (1000) according to claim 11 or 12, wherein: The main body (231) comprises a connected blocking portion (2312) and a lap portion (2313); the blocking portion (2312) is located in the injection channel (211); the lap portion (2313) is provided on at least a portion of the outer periphery of the blocking portion (2312); the lap portion (2313) is placed on the end face (251) of the pole (250) and is welded to the pole (250); 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).

14. The battery cell (1000) terminal assembly (200) according to claim 13, wherein: The thickness of the overlapping portion (2313) ranges from 0.3 mm to 1 mm.

15. The electrode assembly (200) of the battery cell (1000) according to claim 13 or 14, wherein: The thickness of the blocking portion (2312) is greater than the protrusion height of the connecting protrusion (232).

16. The electrode assembly (200) of the battery cell (1000) according to any one of claims 11 to 15, wherein: 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.

17. The battery cell (1000) terminal assembly (200) according to claim 16, wherein: The third end surface (2311) protrudes from the end surface (251) of the pole (250).

18. The electrode assembly (200) of the battery cell (1000) according to claim 17, wherein: The distance between the third end face (2311) and the end face (251) of the pole (250) has a value ranging from 0.05 mm to 1 mm.

19. The electrode assembly (200) of the battery cell (1000) according to any one of claims 16 to 18, wherein: 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 third 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).

20. A battery cell (1000), wherein: include: A housing (300), wherein the housing (300) forms a receiving cavity (310) having an opening (311); 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 19, and the pole assembly (200) is provided at the opening (311); 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 assembly (200) respectively.

21. The battery cell (1000) according to claim 20, wherein: The battery cell (1000) is a cylindrical battery.

22. A battery assembly (10), wherein: Comprising a plurality of battery cells (1000) according to claim 20 or 21.

23. An electrical device (1), wherein: Comprising a battery assembly (10) according to claim 22.

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