Battery cell, battery pack, power utilization device and energy storage device
By setting connecting protrusions in the battery cell and using resistance welding, the problem of poor connection stability between the electrode core and electrode components and the adapter plate was solved, thereby improving the structural stability and safety of the battery cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-03-20
AI Technical Summary
The connection stability between the core and/or electrode components of existing battery cells and the adapter plate is poor, and the welding process is prone to spatter and debris, which leads to short circuit and self-discharge risks.
A first connecting protrusion and/or a second connecting protrusion are provided between the electrode core and electrode components and the adapter plate. The connection stability is improved by resistance welding, and the generation of debris during the welding process is reduced.
It improves the structural stability and safety of battery cells, reduces the risk of metal splashes and debris falling during the welding process, and enhances the working performance and safety of battery cells.
Smart Images
Figure CN224020995U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially is related to a battery monomer, battery package, electric device and energy storage device. BACKGROUND
[0002] With the development of science and technology, the application range of battery monomer is more and more extensive.
[0003] However, the connection stability between the pole core and / or electrode piece and the adapter sheet of the existing battery monomer is poor, and at the same time, different degrees of splashing and debris are also easily produced in the welding process of the pole core and / or electrode piece and the adapter sheet, which leads to the short circuit and self-discharge risk of the battery monomer, and affects the working performance of the battery monomer. SUMMARY
[0004] The utility model aims at at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a battery monomer, which can improve the connection stability of the pole core and / or electrode piece and the adapter sheet, and also reduce the debris produced in the welding process to a certain extent, solve the technical problems of poor structural stability of the battery monomer in the prior art and the short circuit and self-discharge risk of the battery monomer.
[0005] The second purpose of the utility model is to provide a battery package with the above-mentioned battery monomer.
[0006] The third purpose of the utility model is to provide an electric device with the above-mentioned battery monomer or the above-mentioned battery package.
[0007] The fourth purpose of the utility model is to provide an energy storage device with the above-mentioned battery monomer or the above-mentioned battery package.
[0008] The battery monomer according to the utility model embodiment comprises: a pole core and an electrode piece, the pole core and the electrode piece are oppositely arranged in a first direction; an adapter sheet is arranged between the pole core and the electrode piece; wherein a first connecting protrusion is arranged between the adapter sheet and the pole core, and the adapter sheet and the pole core are connected through the first connecting protrusion; and / or a second connecting protrusion is arranged between the adapter sheet and the electrode piece, and the adapter sheet and the electrode piece are resistance-welded through the second connecting protrusion.
[0009] According to the battery monomer provided by the embodiment of the utility model, the first connecting protrusion and / or the second connecting protrusion are arranged, which is favorable for improving the connecting stability of the pole core and / or the electrode piece and the adapter sheet, thereby improving the structural stability of the battery monomer and improving the working performance of the battery monomer.
[0010] In some embodiments, the first connecting protrusion is arranged on a side of the adapter sheet facing the pole core.
[0011] In some embodiments, the pole core comprises a pole lug, and the adapter sheet and the pole lug are resistance-welded through the first connecting protrusion.
[0012] In some embodiments, the first connecting protrusion is integrally formed with the adapter sheet.
[0013] In some embodiments, the second connecting protrusion is arranged on at least one of the adapter sheet and the electrode piece.
[0014] In some embodiments, the second connecting protrusion is arranged on one of the adapter sheet and the electrode piece, and the other of the adapter sheet and the electrode piece is provided with a matching groove, and the second connecting protrusion is limitedly matched in the matching groove.
[0015] In some embodiments, the second connecting protrusion is interference-fitted with the matching groove.
[0016] In some embodiments, the protrusion height of the first connecting protrusion and / or the second connecting protrusion in the first direction is 0.2mm-1.5mm.
[0017] In some embodiments, the depth of the matching groove is 0.1mm-1mm.
[0018] In some embodiments, the first connecting protrusion and / or the second connecting protrusion are in the shape of a circular truncated cone or a racetrack.
[0019] In some embodiments, the maximum dimension of the first connecting protrusion and / or the second connecting protrusion in the second direction and / or the third direction is 1mm-10mm, and the third direction, the second direction and the first direction are mutually intersected.
[0020] In some embodiments, the first connecting protrusion and / or the second connecting protrusion comprise a plurality.
[0021] In some embodiments, the distance between the central axes of two adjacent first connecting protrusions and / or the distance between the central axes of two adjacent second connecting protrusions is 2mm-15mm.
[0022] In some embodiments, the connecting area of the adapter tab and the tab is 5mm 2 -120mm 2 ; and / or, the connecting area of the adapter tab and the electrode member is 5mm 2 -120mm 2 .
[0023] In some embodiments, the battery cell further comprises a metal protection sheet, the pole core comprises a tab, the adapter tab is connected with the tab through the first connecting protrusion, and the metal protection sheet is arranged on the side of the tab away from the adapter tab and faces the first connecting protrusion.
[0024] In some embodiments, the thickness of the metal protection sheet is 0.05mm-0.8mm.
[0025] In some embodiments, the electrode member comprises a pole column and a terminal, the pole column and the terminal are connected, and the adapter tab is connected with the pole column through the second connecting protrusion.
[0026] The battery pack according to the embodiments of the present application comprises the battery cell described above.
[0027] The battery pack according to the embodiments of the present application comprises the battery cell described above.
[0028] The electric device according to the embodiments of the present application comprises the battery cell or the battery pack described above.
[0029] The electric device according to the embodiments of the present application comprises the battery cell or the battery pack described above.
[0030] The energy storage device according to the embodiments of the present application comprises the battery cell or the battery pack described above.
[0031] The energy storage device according to the embodiments of the present application comprises the battery cell or the battery pack described above.
[0032] The additional aspects and advantages of the present application will become apparent from the following description, or will be appreciated by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0033] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings of which:
[0034] Figure 1 Schematic diagram of a battery cell for some embodiments of the first aspect of the present utility model.
[0035] Figure 2 Exploded view of a battery cell for some embodiments of the first aspect of the present utility model.
[0036] Figure 3 Schematic diagram of a tab and a second connecting protrusion for some embodiments of the first aspect of the present utility model.
[0037] Figure 4 Front view of a tab and a second connecting protrusion for some embodiments of the first aspect of the present utility model.
[0038] Figure 5 Top view of a tab and a second connecting protrusion for some embodiments of the first aspect of the present utility model.
[0039] Figure 6 Bottom view of a tab and a first connecting protrusion for some embodiments of the first aspect of the present utility model.
[0040] Figure 7 Schematic diagram of an electrode assembly and a second connecting protrusion for some embodiments of the second aspect of the present utility model.
[0041] Figure 8 Schematic diagram of a tab and a mating groove for some embodiments of the third aspect of the present utility model.
[0042] Figure 9 Schematic diagram of an electrode assembly and a mating groove for some embodiments of the fourth aspect of the present utility model.
[0043] Figure 10 Schematic diagram of a tab and a first connecting protrusion for some embodiments of the fifth aspect of the present utility model.
[0044] Figure 11 Schematic diagram of a tab and a first connecting protrusion for some embodiments of the sixth aspect of the present utility model.
[0045] Figure 12 Schematic diagram of a tab and a first connecting protrusion for some embodiments of the sixth aspect of the present utility model.
[0046] Figure 13 Flowchart of a process for manufacturing a battery cell for some embodiments of the present utility model.
[0047] Reference signs:
[0048] 1000, battery cell;
[0049] 100. Electrode core; 101. First electrode core; 102. Second electrode core; 110. Electrode tab;
[0050] 200. Electrode component; 210. Terminal post; 220.
[0051] 300, Adapter plate; 400, First connecting protrusion; 500, Second connecting protrusion; 600, Housing;
[0052] 700, Groove; 800, Metal protective plate; 900, Cover plate; 910, Insulating component; 920, Sealing ring. Detailed Implementation
[0053] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0054] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0055] The following description of the battery cell 1000 according to an embodiment of the present invention is based on the accompanying drawings.
[0056] Combination Figure 1 and Figure 2 As shown, the battery cell 1000 according to an embodiment of the present invention includes: a core 100, an electrode 200, and an adapter plate 300.
[0057] Among them, such as Figure 2 As shown, the electrode core 100 and the electrode element 200 are arranged opposite each other in a first direction. It should be noted that the first direction referred to here can be understood as... Figure 2As shown in the Z direction, by setting the pole core 100 and the electrode piece 200 to be relatively arranged in the Z direction, on the one hand, the space of the battery monomer 1000 in the Z direction can be fully utilized, so that the pole core 100 and the electrode piece 200 can be simultaneously arranged in the battery monomer 1000, and on the other hand, the connection of the pole core 100 and the electrode piece 200 is facilitated, and the connection difficulty of the pole core 100 and the electrode piece 200 is reduced.
[0058] As shown in the Z direction, by setting the pole core 100 and the electrode piece 200 to be relatively arranged in the Z direction, on the one hand, the space of the battery monomer 1000 in the Z direction can be fully utilized, so that the pole core 100 and the electrode piece 200 can be simultaneously arranged in the battery monomer 1000, and on the other hand, the connection of the pole core 100 and the electrode piece 200 is facilitated, and the connection difficulty of the pole core 100 and the electrode piece 200 is reduced. Figure 2 As shown, the adapter piece 300 is arranged between the pole core 100 and the electrode piece 200. In order to reliably connect the pole core 100 and the electrode piece 200 together by using the adapter piece 300 to form a complete current path, and further reduce the connection difficulty of the pole core 100 and the electrode piece 200, so that the current of the battery monomer 1000 can be smoothly transmitted to the external circuit, or ensure that the external current can be effectively introduced into the pole core 100 during charging, to a certain extent, guarantee the working performance of the battery monomer 1000.
[0059] It should be noted that the adapter piece 300 as a transition component between the pole core 100 and the electrode piece 200 can make the connection of the pole core 100 and the electrode piece 200 more convenient and flexible, and at the same time, it can also reduce the difficulty of assembling the battery monomer 1000, and to a certain extent, it can improve the production efficiency of the battery monomer 1000. Especially in some complex battery monomer 1000 structure, the adapter piece 300 can better adapt to the connection requirements between the pole core 100 and the electrode piece 200 of different shapes and sizes.
[0060] In some embodiments, the adapter piece 300 is made of copper, aluminum and corresponding alloy materials, which can ensure that the current inside the battery monomer 1000 can be transmitted efficiently through the adapter piece 300, reduce the energy loss of the current in the transmission process, and improve the charging and discharging efficiency of the battery monomer 1000. On the other hand, the adapter piece 300 can timely dissipate the heat generated during the charging and discharging process of the battery monomer 1000, which can prevent the local overheating of the battery monomer 1000 to a certain extent, avoid the safety problems caused by overheating of the battery monomer 1000, thereby greatly prolonging the service life of the battery monomer 1000 and improving the use safety of the battery monomer 1000.
[0061] In combination with Figure 2 , Figure 4 and Figure 6As shown, the first connecting protrusion 400 is arranged between the adapter piece 300 and the pole core 100, and the adapter piece 300 and the pole core 100 are connected through the first connecting protrusion 400. The first connecting protrusion 400 can increase the connecting area and the connecting quality of the adapter piece 300 and the pole core 100, so that the adapter piece 300 and the pole core 100 can form an effective connection, improve the connecting stability of the adapter piece 300 and the pole core 100, and further enable the adapter piece 300 and the pole core 100 to effectively transmit the current between the battery monomer 1000 and the external equipment.
[0062] In combination Figure 2 And Figure 3 As shown, the second connecting protrusion 500 is arranged between the adapter piece 300 and the electrode piece 200, and the adapter piece 300 and the electrode piece 200 are resistance-welded through the second connecting protrusion 500. By arranging the second connecting protrusion 500 between the adapter piece 300 and the electrode piece 200, the second connecting protrusion 500 can be used to realize the cooperative connection of the adapter piece 300 and the electrode piece 200, so as to facilitate the increase of the connecting area and the connecting quality of the adapter piece 300 and the electrode piece 200 by using the second connecting protrusion 500.
[0063] Meanwhile, when the adapter piece 300 and the electrode piece 200 are connected by resistance welding, the second connecting protrusion 500 can also enable the welding current between the adapter piece 300 and the electrode piece 200 to flow from the predetermined track of the second connecting protrusion 500 and generate heat, thereby realizing the effective connection between the adapter piece 300 and the electrode piece 200, and preventing the generation of metal splashes during the welding process to some extent, so as to avoid the metal debris from falling into the pole core 100, thereby avoiding the short circuit of the pole core 100 and the phenomenon of self-discharge failure, and improving the use safety of the battery monomer 1000.
[0064] That is, the second connecting protrusion 500 of the present application can not only realize the stable connection of the adapter piece 300 and the electrode piece 200, but also cooperate with the connection mode of resistance welding to reduce the debris generated during the welding process.
[0065] As can be seen from the above structure, the battery monomer 1000 of the embodiment of the present application can improve the connecting stability of the pole core 100 and / or the electrode piece 200 and the adapter piece 300, ensure the connecting quality, and further improve the structural stability of the battery monomer 1000 to some extent.
[0066] Meanwhile, by connecting the adapter sheet 300 and the electrode piece 200 in the way of resistance welding, not only the effective connection between the adapter sheet 300 and the electrode piece 200 can be realized, but also the spatter phenomenon generated in the welding process can be avoided in cooperation with the second connecting protrusion 500, and the metal debris generated in the welding process can be further avoided from falling into the pole core 100, so as to avoid the short circuit and the self-discharge bad phenomenon of the pole core 100, and thus the use safety and the working performance of the battery monomer 1000 can be improved to a certain extent.
[0067] Meanwhile, by connecting in the way of resistance welding, the welding process can be simplified, and the loss of the welding head material can be reduced to a certain extent, and the production cost of the battery monomer 1000 can be saved.
[0068] It can be understood that, compared with the prior art, by setting the first connecting protrusion 400 and / or the second connecting protrusion 500 and connecting the adapter sheet 300 and the electrode piece 200 through the second connecting protrusion 500 by resistance welding, the connection stability of the pole core 100 and / or the electrode piece 200 and the adapter sheet 300 can be improved, and the debris generated in the welding process can be reduced to a certain extent, so that the short circuit or the self-discharge bad phenomenon of the pole core 100 can be avoided to a certain extent, and the working performance of the battery monomer 1000 can be improved.
[0069] In some embodiments, the adapter sheet 300 and the pole core 100 are connected by resistance welding through the first connecting protrusion 400. The effective connection between the adapter sheet 300 and the pole core 100 can be realized, and the metal spatter phenomenon generated in the welding process of the adapter sheet 300 and the pole core 100 can be prevented to a certain extent, so that the metal debris can be further avoided from falling into the pole core 100, so as to avoid the short circuit and the self-discharge bad phenomenon of the pole core 100, and the use safety of the battery monomer 1000 can be improved.
[0070] In a specific example, the setting of the first connecting protrusion 400 can make the welding current flow into the predetermined track of the first connecting protrusion 400 and generate heat in the welding process of the adapter sheet 300 and the pole core 100 by resistance welding, so as to realize the effective connection between the adapter sheet 300 and the pole core 100, and prevent the metal spatter phenomenon generated in the welding process to a certain extent, and thus the metal debris can be avoided from falling into the pole core 100.
[0071] In a specific example, the effective connection between the adapter sheet 300 and the electrode piece 200 and the effective connection between the adapter sheet 300 and the pole core 100 can be realized by using the pressure fusion welding method, so as to realize the effective connection between the electrode piece 200 and the pole core 100, and reduce the spatter and other bad phenomena caused by traditional welding.
[0072] In some embodiments, as Figure 2As shown, the pole core 100 includes a first pole core 101 and a second pole core 102. The first pole core 101 and the second pole core 102 cooperate to facilitate increasing the voltage and capacity of the battery monomer 1000, and can share the current and chemical reaction during the charging and discharging process of the battery monomer 1000, to a certain extent, improve the charging and discharging efficiency and power performance of the battery monomer 1000.
[0073] In some embodiments, the first pole core 101 and the second pole core 102 can be connected in series.
[0074] In some embodiments, in combination Figure 1 and Figure 2 As shown, the battery monomer 1000 further includes a shell 600, which is wrapped around the outer periphery of the pole core 100. Here, it can also be understood that the pole core 100 is arranged in the shell 600, so as to protect the pole core 100 by using the shell 600, thereby facilitating resisting the impact force of external impact on the internal components (such as the pole core 100) of the battery monomer 1000 by using the shell 600, to a certain extent, can ensure the working stability of the internal components of the battery monomer 1000, and is conducive to prolonging the service life of the battery monomer 1000.
[0075] In some embodiments, in combination Figure 1 and Figure 2 As shown, the battery monomer 1000 further includes a cover plate 900, the shell 600 is formed into an open receiving cavity at one end, the pole core 100 is arranged in the receiving cavity, and the cover plate 900 is arranged at the opening. So that the receiving cavity can be formed into a sealed structure, and it is convenient to use the cover plate 900 to provide a stable support structure for the pole core 100 and other components such as electrolyte inside the battery monomer 1000, so that the pole core 100 and other components such as electrolyte can maintain a relatively fixed position inside the battery monomer 1000, to a certain extent, prevent internal components from being displaced or damaged due to shaking or vibration during use of the battery monomer 1000, thereby ensuring the working performance of the battery monomer 1000.
[0076] In some embodiments, in combination Figure 1 and Figure 2 As shown, the electrode piece 200 is arranged on the cover plate 900, so as to use the cover plate 900 to support the electrode piece 200, improve the position stability of the electrode piece 200, and to a certain extent, ensure the working performance of the electrode piece 200.
[0077] In some embodiments, in combination Figure 1 and Figure 2As shown, the sealing ring 920 is arranged between the electrode piece 200 and the cover plate 900, and the sealing ring 920 not only can realize the sealing cooperation between the electrode piece 200 and the cover plate 900, but also can make the electrode piece 200 and the cover plate 900 form an insulation connection, so as to ensure the working performance of the electrode piece 200 and the cover plate 900 and improve the use safety of the battery monomer 1000.
[0078] In some embodiments, as shown in Figure 2 As shown, the battery monomer 1000 further comprises an insulation piece 910 arranged between the cover plate 900 and the pole core 100, and the insulation piece 910 can avoid the leakage phenomenon of the battery monomer 1000 to a certain extent and improve the use safety of the battery monomer 1000. Meanwhile, the insulation piece 910 can effectively support the end face of the pole core 100. Since the pole core 100 is assembled into the shell and the cover plate 900 is welded after being assembled into the shell, the internal winding core of the pole core 100 is in a slightly compressed state, and the pole core 100 is in a vibrating environment during the use process. If the pole core 100 is not bound enough, the service life of the pole core 100 will be easily affected or short circuit will occur. Therefore, the insulation piece 910 is arranged to effectively support the end face of the pole core 100, so as to reduce the possibility of the up-and-down movement of the pole core 100 and improve the position stability of the pole core 100, thereby ensuring the working performance of the pole core 100 to a certain extent.
[0079] In some embodiments, as shown in Figure 2 , Figure 4 and Figure 6 The first connecting protrusion 400 is arranged on the side of the adapter piece 300 facing the pole core 100. Thus, the first connecting protrusion 400 is arranged between the adapter piece 300 and the pole core 100, so as to facilitate the effective connection between the adapter piece 300 and the pole core 100 by using the first connecting protrusion 400 and improve the connection quality of the adapter piece 300 and the pole core 100.
[0080] Of course, in other embodiments, the first connecting protrusion 400 can also be arranged on the side of the pole core 100 facing the adapter piece 300 (not shown in the example). In this way, the first connecting protrusion 400 can also be arranged between the adapter piece 300 and the pole core 100, so as to facilitate the effective connection between the adapter piece 300 and the pole core 100 by using the first connecting protrusion 400.
[0081] In some embodiments, as shown in Figure 2 The pole core 100 comprises a tab 110, and the adapter piece 300 and the tab 110 are connected by resistance welding through the first connecting protrusion 400. Thus, the adapter piece 300 and the pole core 100 are arranged to be connected by resistance welding through the first connecting protrusion 400, so as to reduce the connection difficulty of the adapter piece 300 and the pole core 100.
[0082] Meanwhile, the adapter sheet 300 and the tab 110 are electrically resistance-welded by the first connecting protrusion 400, which can also prevent the generation of metal splashes during the welding of the adapter sheet 300 and the tab 100 to some extent, thereby further avoiding the falling of metal debris into the tab 100 to avoid the short circuit and self-discharge of the tab 100 and improve the safety of the battery monomer 1000.
[0083] In some embodiments, the first connecting protrusion 400 is integrally formed with the adapter sheet 300, so that the first connecting protrusion 400 and the adapter sheet 300 are formed as an integral piece, which can not only increase the connection strength of the first connecting protrusion 400 and the adapter sheet 300, but also can save the welding or bonding steps between the first connecting protrusion 400 and the adapter sheet 300, thereby reducing the connection difficulty of the first connecting protrusion 400 and the adapter sheet 300 to some extent.
[0084] Optionally, the first connecting protrusion 400 can be formed as an integral piece with the adapter sheet 300 by stamping, machining or extrusion, etc.
[0085] Of course, in other embodiments, the first connecting protrusion 400 and the adapter sheet 300 can also be formed as separate pieces, that is, the first connecting protrusion 400 and the adapter sheet 300 are separately processed and formed and then connected, which can also achieve the connection of the first connecting protrusion 400 on the adapter sheet 300.
[0086] In some embodiments, in combination with the description of Figure 3 and Figure 7 It is shown that the second connecting protrusion 500 is arranged on at least one of the adapter sheet 300 and the electrode piece 200. It can be understood that the second connecting protrusion 500 can be arranged on the adapter sheet 300, or the second connecting protrusion 500 can be arranged on the electrode piece 200, or the second connecting protrusion 500 can be arranged on both the adapter sheet 300 and the electrode piece 200, so as to realize the cooperative connection of the adapter sheet 300 and the electrode piece 200 by using the second connecting protrusion 500.
[0087] Meanwhile, by arranging the second connecting protrusion 500, the welding current can flow into the predetermined track of the second connecting protrusion 500 and generate heat, which can realize the effective connection between the adapter sheet 300 and the electrode piece 200 and reduce the generation of metal slag.
[0088] It should be noted that when the second connecting protrusion 500 is arranged on the adapter sheet 300, the second connecting protrusion 500 and the adapter sheet 300 can be integrally formed; when the second connecting protrusion 500 is arranged on the electrode piece 200, the second connecting protrusion 500 and the electrode piece 200 can also be integrally formed, so as to reduce the forming difficulty of the second connecting protrusion 500 and be conducive to improving the positional stability of the second connecting protrusion 500, thereby ensuring the working performance of the second connecting protrusion 500 to some extent.
[0089] Wherein, the integrally formed as used herein is not limited to forming by punching, machining or extruding and the like, that is, the second connecting protrusion 500 can be formed into an integral piece with the adapter piece 300 by punching, machining or extruding and the like, or the second connecting protrusion 500 can be formed into an integral piece with the electrode piece 200 by punching, machining or extruding and the like, which is not specifically limited in the present application.
[0090] In some embodiments, as shown in Figure 3 , Figure 7 , Figure 8 and Figure 9 , the second connecting protrusion 500 is arranged on one of the adapter piece 300 and the electrode piece 200, and the other of the adapter piece 300 and the electrode piece 200 is provided with a matching groove 700, and the second connecting protrusion 500 is limitedly matched in the matching groove 700. Here, when the second connecting protrusion 500 is arranged on the adapter piece 300, the electrode piece 200 is provided with the matching groove 700 (as shown in Figure 3 and Figure 9 ); when the second connecting protrusion 500 is arranged on the electrode piece 200, the adapter piece 300 is provided with the matching groove 700 (as shown in Figure 7 and Figure 8 ), so that when the adapter piece 300 and the electrode piece 200 are connected by the second connecting protrusion 500, the second connecting protrusion 500 can be limitedly matched in the matching groove 700, the matching groove 700 can be used for positioning and wrapping the second connecting protrusion 500, so that a stable connection is formed between the adapter piece 300 and the electrode piece 200, and the connection strength of the adapter piece 300 and the electrode piece 200 is effectively increased.
[0091] Of course, in other embodiments, when the second connecting protrusion 500 is arranged on the adapter piece 300, the electrode piece 200 can also not be provided with the matching groove 700; correspondingly, when the second connecting protrusion 500 is arranged on the electrode piece 200, the adapter piece 300 can also not be provided with the matching groove 700, so as to reduce the forming difficulty of the electrode piece 200 or the adapter piece 300.
[0092] In specific examples, when the second connecting protrusion 500 is provided on the adapter piece 300, the electrode 200 does not have the second connecting protrusion 500, that is, the surface of the electrode 200 facing the adapter piece 300 is formed as a plane, reducing the molding difficulty of the electrode 200; or, when the second connecting protrusion 500 is provided on the adapter piece 300, the electrode 200 also has the second connecting protrusion 500, effectively increasing the connection area between the adapter piece 300 and the electrode 200; or, when the second connecting protrusion 500 is provided on the adapter piece 300, the electrode 200 has a mating groove 700 that limits and cooperates with the second connecting protrusion 500, thereby increasing the connection strength between the adapter piece 300 and the electrode 200.
[0093] Correspondingly, when the second connecting protrusion 500 is provided on the electrode 200, the adapter 300 is not provided with the second connecting protrusion 500, so that the surface of the adapter 300 facing the electrode 200 is formed as a plane, reducing the molding difficulty of the adapter 300; or, when the second connecting protrusion 500 is provided on the electrode 200, the adapter 300 is also provided with the second connecting protrusion 500, effectively increasing the connection area between the adapter 300 and the electrode 200; or, when the second connecting protrusion 500 is provided on the electrode 200, the adapter 300 is provided with a mating groove 700 that limits and cooperates with the second connecting protrusion 500, thereby increasing the connection strength between the adapter 300 and the electrode 200.
[0094] Optionally, the mating groove 700 can be integrated with the adapter piece 300 or the electrode piece 200 by means of stamping, machining or extrusion, thereby reducing the forming difficulty of the mating groove 700.
[0095] In some embodiments, the second connecting protrusion 500 and the mating groove 700 are interference-fitted. This helps to increase the connection strength between the second connecting protrusion 500 and the mating groove 700, thereby improving the stability of the connection structure between the adapter piece 300 and the electrode 200 to a certain extent.
[0096] In some embodiments, such as Figure 4 As shown, the protrusion height of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the first direction is 0.2mm to 1.5mm. Here, the protrusion height of the first connecting protrusion 400 in the first direction can be understood as... Figure 4 The height of the second connecting protrusion 500 in the first direction, as shown in the figure, can be understood as h1. Figure 4When the protrusion height of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the first direction is too low, not only the reinforced connection performance of the first connecting protrusion 400 and / or the second connecting protrusion 500 is affected, but also the welding current not only flows from the first connecting protrusion 400 and / or the second connecting protrusion 500, but also flows from other contact positions of the tab 110 and the adapter sheet 300 and the adapter sheet 300 and the electrode piece 200, thereby causing the welding current to be shunted, which affects the welding effect. When the protrusion height of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the first direction is too high, the first connecting protrusion 400 and / or the second connecting protrusion 500 excessively occupies the space area inside the battery monomer 1000, thereby reducing the capacity area of the pole core 100.
[0097] Meanwhile, when the protrusion height of the first connecting protrusion 400 in the first direction is too high, there is a risk of breaking through the tab 110 and the isolation film, which affects the working performance of the tab 110 and the isolation film.
[0098] In summary, the protrusion height of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the first direction is set to 0.2mm-1.5mm, which not only avoids the shunting of the welding current, but also guarantees the capacity area of the pole core 100, thereby guaranteeing the working performance of the pole core 100. In addition, it can greatly avoid breaking through the tab 110 and the isolation film, thereby guaranteeing the working performance of the tab 110 and the isolation film.
[0099] Specifically, the protrusion height of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the first direction is 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc.
[0100] In some embodiments, the depth of the matching groove 700 is 0.1mm-1mm. In order to realize the interference fit between the second connecting protrusion 500 and the matching groove 700, so that the inner wall of the matching groove 700 and the outer wall of the second connecting protrusion 500 can be in close contact, thereby improving the matching strength of the second connecting protrusion 500 and the matching groove 700.
[0101] Specifically, the depth of the matching groove 700 is 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc.
[0102] In some embodiments, in combination with Figure 3 , Figure 10 and Figure 11As shown, the first connecting protrusion 400 and / or the second connecting protrusion 500 is in the shape of a circular truncated cone or a racetrack. Among them, when the first connecting protrusion 400 and / or the second connecting protrusion 500 is in the shape of a circular truncated cone, it is beneficial to reduce the difficulty of forming the first connecting protrusion 400 and / or the second connecting protrusion 500; when the first connecting protrusion 400 and / or the second connecting protrusion 500 is in the shape of a racetrack, the area of the first connecting protrusion 400 and / or the second connecting protrusion 500 can be increased, and the working performance of the first connecting protrusion 400 and / or the second connecting protrusion 500 can be improved.
[0103] At this time, by setting the shape of the first connecting protrusion 400 and / or the second connecting protrusion 500, the welding current can flow along the predetermined track of the first connecting protrusion 400 and / or the second connecting protrusion 500, thereby ensuring the welding effect.
[0104] It should be noted that the first connecting protrusion 400 and / or the second connecting protrusion 500 can be in the shape of a circular truncated cone or a racetrack, which means that the shapes of the first connecting protrusion 400 and the second connecting protrusion 500 can be the same or different, for example: when the first connecting protrusion 400 is in the shape of a circular truncated cone, the second connecting protrusion 500 can be in the shape of a circular truncated cone or a racetrack; similarly, when the first connecting protrusion 400 is in the shape of a racetrack, the second connecting protrusion 500 can be in the shape of a circular truncated cone or a racetrack.
[0105] In some embodiments, the maximum dimension of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the second direction and / or the third direction is in the range of 1mm to 10mm, and the third direction, the second direction and the first direction intersect with each other. Among them, the second direction mentioned here can be understood as the X direction shown in Figure 3 the Y direction shown in Figure 3 When the maximum dimension of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the second direction and / or the third direction is too large, it will cause the welding area to increase, and then the welding current will easily spread to the surrounding, which may cause a virtual weld, so that the connection between the pole core 100 and / or the electrode piece 200 and the adapter sheet 300 is not firm, affecting the working performance of the battery monomer 1000; when the maximum dimension of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the second direction and / or the third direction is too small, on the one hand, it will affect the reinforcing connection performance of the first connecting protrusion 400 and / or the second connecting protrusion 500, and on the other hand, it will also cause the current output to be unable to meet the flow, resulting in serious heat generation of the battery monomer 1000, affecting the working performance of the battery monomer 1000.
[0106] In summary, the maximum dimension of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the second direction and / or the third direction is set to 1mm-10mm, which can ensure the stable connection between the pole core 100 and / or the electrode piece 200 and the adapter sheet 300, thereby ensuring the working performance of the battery monomer 1000.
[0107] Specifically, the maximum dimension of the first connecting protrusion 400 and / or the second connecting protrusion 500 in the second direction and / or the third direction is 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.
[0108] In the description of the utility model, the features limited by "first", "second" and "third" can be explicitly or implicitly include one or more of the features, which are used to distinguish the description features and have no order and no difference.
[0109] In some embodiments, as shown in Figure 2 , Figure 6 , Figure 10 and Figure 11 , the first connecting protrusion 400 and / or the second connecting protrusion 500 includes multiple. Among them, the multiple first connecting protrusions 400 are used to increase the connection strength of the adapter sheet 300 and the pole core 100, and make the welding effect of the adapter sheet 300 and the pole core 100 better, the multiple first connecting protrusions 400 are used to increase the connection strength of the adapter sheet 300 and the electrode piece 200, and make the welding effect of the adapter sheet 300 and the electrode piece 200 better, thereby increasing the connection quality of the pole core 100 and / or the electrode piece 200 and the adapter sheet 300, and improving the working performance of the battery monomer 1000.
[0110] In the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more than two.
[0111] In some embodiments, the distance between the center axes of two adjacent first connecting protrusions 400 and / or the center axes of two adjacent second connecting protrusions 500 is 2mm-15mm. Here, when the first connecting protrusion 400 includes multiple, the distance between the center axes of two adjacent first connecting protrusions 400 is 2mm-15mm; when the second connecting protrusion 500 includes multiple, the distance between the center axes of two adjacent second connecting protrusions 500 is 2mm-15mm.
[0112] When the distance between the center axes of the two adjacent first connecting protrusions 400 and / or the center axes of the two adjacent second connecting protrusions 500 is too short, it is not easy to process the plurality of first connecting protrusions 400 and / or the plurality of second connecting protrusions 500, increasing the processing difficulty of the first connecting protrusions 400 and / or the second connecting protrusions 500; when the distance between the center axes of the two adjacent first connecting protrusions 400 and / or the center axes of the two adjacent second connecting protrusions 500 is too long, it will result in that a larger number of first connecting protrusions 400 and / or second connecting protrusions 500 cannot be arranged.
[0113] In summary, the distance between the center axes of the two first connecting protrusions 400 and / or the center axes of the two adjacent second connecting protrusions 500 is set to 2mm-15mm, which not only reduces the processing difficulty of the first connecting protrusions 400 and the second connecting protrusions 500, but also facilitates the processing of a larger number of first connecting protrusions 400 and / or second connecting protrusions 500.
[0114] Specifically, the distance between the center axes of the two adjacent first connecting protrusions 400 and / or the center axes of the two adjacent second connecting protrusions 500 is 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, etc.
[0115] In some embodiments, the connection area of the adapter tab 300 and the tab 110 is in the range of 5mm 2 -120mm 2 .
[0116] It should be noted that when the first connecting protrusion 400 is integrally formed with the adapter tab 300, the connection area of the adapter tab 300 and the tab 110 herein can be understood as the connection area of all first connecting protrusions 400 and the tab 110 after the adapter tab 300 and the tab 110 are welded. When the connection area of the adapter tab 300 and the tab 110 is too small, the current output of the electrode core 100 will have a small overcurrent area, which will further result in low working efficiency of the battery monomer 1000; when the connection area of the adapter tab 300 and the tab 110 is too large, the welding current will spread around through the first connecting protrusion 400, which will result in that the connection between the adapter tab 300 and the tab 110 is not firm, affecting the working performance of the battery monomer 1000.
[0117] In summary, the connection area of the adapter tab 300 and the tab 110 is set to 5mm 2 -120mm 2, which can ensure the overcurrent area of the current output of the pole core 100 to a certain extent, avoid the false welding between the adapter piece 300 and the tab 110, and further ensure the firm connection between the adapter piece 300 and the tab 110, so as to ensure the working performance of the battery monomer 1000.
[0118] Specifically, the connection area of the adapter piece 300 and the tab 110 is 5mm 2 , 20mm 2 , 35mm 2 , 60mm 2 , 75mm 2 , 90mm 2 , 105mm 2 or 120mm 2 , etc.
[0119] In some embodiments, the connection area of the adapter piece 300 and the electrode piece 200 ranges from 5mm 2 to 120mm 2 .
[0120] It should be noted that when the second connection protrusion 500 is arranged on the adapter piece 300, the connection area of the adapter piece 300 and the electrode piece 200 here refers to the connection area of all the second connection protrusions 500 and the electrode piece 200 after the adapter piece 300 and the electrode piece 200 are welded; when the second connection protrusion 500 is arranged on the electrode piece 200, the connection area of the adapter piece 300 and the electrode piece 200 here refers to the connection area of all the second connection protrusions 500 and the adapter piece 300 after the adapter piece 300 and the electrode piece 200 are welded. When the connection area of the adapter piece 300 and the electrode piece 200 is too small, the overcurrent area of the current output of the pole core 100 is small, which further leads to the low working efficiency of the battery monomer 1000. When the connection area of the adapter piece 300 and the electrode piece 200 is too large, the welding current spreads to the surrounding through the second connection protrusion 500, which leads to the unfirm connection between the adapter piece 300 and the electrode piece 200 and affects the working performance of the battery monomer 1000.
[0121] Therefore, when the connection area of the adapter piece 300 and the electrode piece 200 ranges from 5mm 2 to 120mm 2 , the overcurrent area of the current output of the pole core 100 can be ensured to a certain extent, the false welding between the adapter piece 300 and the electrode piece 200 can be avoided, and the firm connection between the adapter piece 300 and the electrode piece 200 can be ensured, so as to ensure the working performance of the battery monomer 1000.
[0122] Specifically, the connection area of the adapter piece 300 and the electrode piece 200 is 5mm 2 , 20mm 235mm 2 60mm 2 75mm 2 90mm 2 105mm 2 or 120mm 2 etc.
[0123] In some embodiments, in combination with the above Figure 2 and Figure 12 as shown, the battery cell 1000 further comprises a metal protection sheet 800, the pole core 100 comprises a pole tab 110, the adapter tab 300 is connected with the pole tab 110 through the first connecting protrusion 400, and the metal protection sheet 800 is arranged on the side of the pole tab 110 away from the adapter tab 300 and faces the first connecting protrusion 400. The metal protection sheet 800 can play a welding auxiliary role, so that the welding process of the adapter tab 300 and the pole tab 110 is more stable, and to a certain extent, the welding quality between the adapter tab 300 and the pole tab 110 can be improved.
[0124] Optionally, the metal protection sheet 800 can be made of copper, aluminum, stainless steel, nickel or alloy materials, etc.
[0125] In some embodiments, the thickness of the metal protection sheet 800 is in the range of 0.05mm-0.8mm. When the thickness of the metal protection sheet 800 is too thin, the metal protection sheet 800 cannot protect the pole tab 110, affecting the working performance of the metal protection sheet 800; when the thickness of the metal protection sheet 800 is too thick, the metal protection sheet 800 will occupy too much internal space of the battery cell 1000, affecting the capacity of the pole core 100, thereby affecting the working performance of the pole core 100.
[0126] In summary, when the thickness of the metal protection sheet 800 is set to 0.05mm-0.8mm, the metal protection sheet 800 can not only protect the pole tab 110 during welding, but also can avoid occupying too much internal space of the battery cell 1000, ensuring the capacity of the pole core 100, and further ensuring the working performance of the pole core 100.
[0127] Specifically, the thickness of the metal protection sheet 800 is 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm or 0.8mm, etc.
[0128] Of course, in some other embodiments, the metal protection sheet 800 can not be provided, so as to simplify the structure of the battery cell 1000 and reduce the forming difficulty of the battery cell 1000.
[0129] In some embodiments, the electrode piece 200 is connected to the terminal 220, and the adapter piece 300 is connected to the electrode piece 200 through the second connecting protrusion 500. Figure 1 and Figure 2 As shown in FIGS. 1 and 2, the electrode piece 200 includes a pole 210 and a terminal 220, the pole 210 and the terminal 220 are connected, and the adapter piece 300 is connected to the pole 210 through the second connecting protrusion 500. Thus, the adapter piece 300 is connected to the electrode piece 200, and the connection difficulty of the adapter piece 300 and the electrode piece 200 is reduced, so that the current between the battery monomer 1000 and the external device can be effectively transmitted.
[0130] The manufacturing method of the battery monomer 1000 according to the embodiments of the present application is described below with reference to the accompanying drawings of the specification.
[0131] In combination with Figure 2 and Figure 13 As shown in FIGS. 1 and 2, the manufacturing method of the battery monomer 1000 according to the embodiments of the present application includes the following steps:
[0132] First step: loading and positioning the first pole core 101, and loading and positioning the second pole core 102. Here, it can be understood that when the pole core 100 includes the first pole core 101 and the second pole core 102, the first pole core 101 and the second pole core 102 are loaded and positioned respectively, so that the relative position of the first pole core 101 and the second pole core 102 is stable, so as to form the pole core 100.
[0133] In some embodiments, loading the first pole core 101 and the second pole core 102 can be understood as assembling the first pole core 101 and the second pole core 102 into the shell 600.
[0134] Second step: building the tab 110, so that the first pole core 101 and the second pole core 102 are combined into the pole core 100, and the adapter piece 300 is loaded and positioned.
[0135] Third step: positioning and combining the tab 110 and the adapter piece 300. The relative position of the tab 110 and the adapter piece 300 is accurate, so as to facilitate the connection of the tab 110 and the adapter piece 300.
[0136] Fourth step: resistance welding the tab 110 and the adapter piece 300, and loading and positioning the cover plate 900. The tab 110 and the adapter piece 300 are resistance welded to realize the connection of the pole core 100 and the adapter piece 300, ensure the connection strength of the pole core 100 and the adapter piece 300, and reduce the generation of welding slag.
[0137] In addition, the cover plate 900 is loaded and positioned to facilitate the subsequent fixation of the cover plate 900.
[0138] In some embodiments, the welding current of the resistance welding between the tab 110 and the adapter piece 300 is 10KA-25KA, the welding pressure is 1KN-4KN, and the welding time is 0.5S-2S, so as to ensure the connection quality of the tab 110 and the adapter piece 300.
[0139] In the fifth step, the tab 110, the adapter piece 300 and the cover plate 900 are positioned and combined, so that the relative position of the adapter piece 300 and the cover plate 900 is accurate, thereby facilitating the cooperation and connection of the adapter piece 300 and the cover plate 900, and facilitating the cooperation and connection of the adapter piece 300 and the electrode piece 200.
[0140] In the sixth step, the adapter piece 300 and the electrode piece 200 on the cover plate 900 are resistance-welded, so as to realize the cooperation and connection of the electrode piece 200 and the adapter piece 300, ensure the connection strength of the electrode piece 200 and the adapter piece 300, and reduce the generation of welding slag.
[0141] In some embodiments, the welding current of the resistance welding between the adapter piece 300 and the electrode piece 200 is 10KA-25KA, the welding pressure is 1KN-4KN, and the welding time is 0.5S-2S, so as to ensure the connection quality of the adapter piece 300 and the electrode piece 200.
[0142] In the seventh step, the battery monomer 1000 flows into the next assembly process.
[0143] The battery pack of the utility model embodiment is described below.
[0144] According to the battery pack of the utility model embodiment, the battery monomer 1000 is used, so that the safety of the battery pack can be effectively ensured to a certain extent, and the working performance of the battery pack is improved.
[0145] The specific structure of the battery monomer 1000 or the battery pack is not described herein.
[0146] According to the battery pack of the utility model embodiment, the battery monomer 1000 is used, so that the safety of the battery pack can be effectively ensured to a certain extent, and the working performance of the battery pack is improved.
[0147] The power consumption device of the utility model embodiment is described below.
[0148] According to the power consumption device of the utility model embodiment, the battery monomer 1000 or the battery pack is used.
[0149] The specific structure of the battery monomer 1000 or the battery pack is not described herein.
[0150] According to the power utilization device, the safety of the power utilization device can be effectively ensured to a certain extent, and the working performance of the power utilization device is improved.
[0151] The power utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like.
[0152] The electric toy can include a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy, and an electric aircraft toy; the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft; and the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer.
[0153] In some embodiments, the power utilization device is a vehicle, which can be a pure electric vehicle or a hybrid vehicle.
[0154] The energy storage device is described below.
[0155] According to the energy storage device, the safety of the energy storage device can be effectively ensured to a certain extent, and the working performance of the energy storage device is improved.
[0156] The battery monomer 1000 is the aforementioned battery monomer 1000, and the battery pack is the aforementioned battery pack, and the specific structure of the battery monomer 1000 or the battery pack is not described herein.
[0157] According to the energy storage device, the safety of the energy storage device can be effectively ensured to a certain extent, and the working performance of the energy storage device is improved.
[0158] In the description of the present application, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", and "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0159] Figure 10Two first connecting protrusions 400 are shown for illustrative purposes, but one of ordinary skill in the art, after reading the above disclosure, will understand that the solution can be applied to three, four, five, or more first connecting protrusions 400, which also falls within the scope of the present application.
[0160] Other configurations of the battery cell 1000, the battery pack, the power consuming device, and the energy storage device according to the embodiments of the present application, such as the specific structure of the housing 600 and the cover plate 900, are known to one of ordinary skill in the art, and will not be described in detail herein.
[0161] In the description of the present application, the description referring to the terms "embodiment", "example", and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0162] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A battery cell, characterized in that, include: The electrode core (100) and the electrode element (200) are disposed opposite to each other in a first direction; An adapter plate (300) is disposed between the electrode core (100) and the electrode element (200); Wherein, a first connecting protrusion (400) is provided between the adapter piece (300) and the pole core (100), and the adapter piece (300) and the pole core (100) are connected through the first connecting protrusion (400); and / or, A second connecting protrusion (500) is provided between the adapter plate (300) and the electrode (200), and the adapter plate (300) and the electrode (200) are connected by resistance welding through the second connecting protrusion (500).
2. The battery cell according to claim 1, characterized in that, The first connecting protrusion (400) is located on the side of the adapter piece (300) facing the pole core (100).
3. The battery cell according to claim 1, characterized in that, The electrode core (100) includes an electrode tab (110), and the adapter piece (300) and the electrode tab (110) are connected by resistance welding through the first connecting protrusion (400).
4. The battery cell according to claim 3, characterized in that, The first connecting protrusion (400) is integrally formed with the adapter piece (300).
5. The battery cell according to claim 1, characterized in that, The second connecting protrusion (500) is provided on at least one of the adapter piece (300) and the electrode piece (200).
6. The battery cell according to claim 5, characterized in that, The second connecting protrusion (500) is provided on one of the adapter piece (300) and the electrode (200), and the other of the adapter piece (300) and the electrode (200) is provided with a mating groove (700), and the second connecting protrusion (500) is limited and fitted in the mating groove (700).
7. The battery cell according to claim 6, characterized in that, The second connecting protrusion (500) is interference-fitted with the mating groove (700).
8. The battery cell according to claim 6, characterized in that, The protrusion height of the first connecting protrusion (400) and / or the second connecting protrusion (500) in the first direction is 0.2mm to 1.5mm.
9. The battery cell according to claim 8, characterized in that, The depth of the mating groove (700) is 0.1mm to 1mm.
10. The battery cell according to claim 1, characterized in that, The first connecting protrusion (400) and / or the second connecting protrusion (500) are shaped like a frustum or a racetrack.
11. The battery cell according to claim 1, characterized in that, The maximum dimension of the first connecting protrusion (400) and / or the second connecting protrusion (500) in the second direction and / or the third direction is in the range of 1mm to 10mm, and the third direction, the second direction and the first direction intersect each other.
12. The battery cell according to claim 1, characterized in that, The first connecting protrusion (400) and / or the second connecting protrusion (500) may include a plurality of protrusions.
13. The battery cell according to claim 12, characterized in that, The distance between the central axes of two adjacent first connecting protrusions (400) and / or the central axes of two adjacent second connecting protrusions (500) is 2mm to 15mm.
14. The battery cell according to claim 3, characterized in that, The connection area between the adapter plate (300) and the electrode (110) is within the range of 5 mm. 2 ~120mm 2 ; and / or, The connection area between the adapter plate (300) and the electrode (200) is within the range of 5 mm. 2 ~120mm 2 .
15. The battery cell according to any one of claims 1-14, characterized in that, It also includes a metal protective sheet (800), the electrode core (100) includes an electrode tab (110), the adapter plate (300) is connected to the electrode tab (110) through the first connecting protrusion (400), and the metal protective sheet (800) is disposed on the side of the electrode tab (110) away from the adapter plate (300) and facing the first connecting protrusion (400).
16. The battery cell according to claim 15, characterized in that, The thickness of the metal protective sheet (800) ranges from 0.05 mm to 0.8 mm.
17. The battery cell according to claim 1, characterized in that, The electrode (200) includes a pole (210) and a terminal (220), the pole (210) and the terminal (220) are connected, and the adapter (300) is connected to the pole (210) through the second connecting protrusion (500).
18. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1-17.
19. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-17 or a battery pack according to claim 18.
20. An energy storage device, characterized in that, Includes a battery cell according to any one of claims 1-17 or a battery pack according to claim 18.