Battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell which comprises a pole group assembly, supporting components and spacing components, the supporting components are arranged on at least one side of the pole group assembly in the first preset direction, and the spacing components are connected with the supporting components; the pole group assembly comprises a plurality of pole groups which are sequentially arranged in the second preset direction, at least one of the two ends, close to each other, of any two adjacent pole groups forms an avoiding groove, and the pole lug clusters of the pole groups are arranged in the corresponding avoiding grooves; a spacing component is arranged between any two adjacent pole groups, a mounting passing opening is formed in the spacing component, and the pole lug clusters of the pole groups can extend into the avoiding grooves of the adjacent pole groups through the mounting passing opening. The utility model provides the longer battery cell, the overall capacity is increased, the overall pole group in the battery cell is designed to be of a split structure, the length of the pole piece of the pole group is reduced, and then the problems of wrinkling, deformation, channeling or breakage and the like are not prone to occurring in the pole piece production and later assembly process.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell. Background Technology

[0002] Currently, battery cell structures are generally short, and the overall capacity improvement space is limited by process conditions. If the length of the battery cell is increased in order to increase the capacity, which in turn increases the length of the electrode assembly, that is, increases the length of the electrode sheet, then defects such as wrinkles, deformation, delamination or breakage are likely to occur during the electrode sheet production and subsequent assembly, resulting in a decrease in yield. Utility Model Content

[0003] The purpose of this application is to provide a battery cell that, to a certain extent, solves the technical problem in the prior art where, in order to increase capacity, the battery cell needs to be designed to be longer, which in turn increases the length of the electrode assembly, that is, increases the length of the electrode sheet. This leads to defects such as wrinkles, deformation, delamination, or breakage during the production and subsequent assembly of the electrode sheet, resulting in a decrease in yield.

[0004] This application provides a battery cell, including: an electrode assembly, a support member, and a spacer member; wherein, along a first preset direction, at least one side of the electrode assembly is provided with the support member, and the spacer member is connected to the support member;

[0005] The pole assembly includes a plurality of pole groups arranged sequentially along a second preset direction, and at least one of the two ends of any two adjacent pole groups that are close to each other forms an avoidance groove, and the pole tab cluster of the pole group is disposed in the corresponding avoidance groove.

[0006] The spacer member is provided between any two adjacent pole groups, the spacer member having an installation opening, and the pole tab cluster of the pole group can extend through the installation opening into the clearance groove of the adjacent pole group.

[0007] In the above technical solution, further, along the third preset direction, at least one side wall of the avoidance groove is formed with an avoidance opening; the battery cell also includes a protective sheet, and along the third preset direction, at least one side of the electrode group is provided with the protective sheet, and the protective sheet covers the avoidance opening.

[0008] In any of the above technical solutions, the spacer member and the support member are further detachably connected.

[0009] In any of the above technical solutions, one of the spacer member and the support member is further provided with a slot, and one of the spacer member and the support member is provided with a plug-in portion, which is plugged into the slot.

[0010] In any of the above technical solutions, the battery cell further includes a support end plate, and the support end plate is provided at least one end of the electrode assembly along the second preset direction, and the support end plate is connected to the support member; the support end plate has a through hole.

[0011] In any of the above technical solutions, the supporting end plate and the supporting component are further integrated injection molded structures.

[0012] In any of the above technical solutions, the battery cell further includes an insulating film, and the insulating film wraps around the outside of the entire assembly of the electrode assembly, the supporting member, the spacer member, and the supporting end plate, and at least one end of the insulating film is open along the second preset direction.

[0013] In any of the above technical solutions, the support end plate is further connected to the adjacent pole group by thermal fusion.

[0014] In any of the above technical solutions, the supporting end plate is further made of an insulating material.

[0015] In any of the above technical solutions, the spacer member is further provided with a cut, and the two ends of the cut are respectively connected to the mounting port and the outside, and the electrode tabs of the electrode group can be moved into the mounting port through the cut.

[0016] In any of the above technical solutions, furthermore, clearance grooves are formed at the two ends of any two adjacent pole groups that are close to each other.

[0017] In any of the above technical solutions, a plurality of protrusions are formed on the side of the support member away from the pole group, and the plurality of protrusions are arranged sequentially at intervals along the second preset direction.

[0018] In any of the above technical solutions, further, one of the two adjacent pole groups has a positive electrode tab at its two ends that are close to each other, and the other has a negative electrode tab. The positive electrode tab and the negative electrode tab are stacked together and connected by welding.

[0019] In any of the above technical solutions, the battery cell further includes a housing and a cover plate; wherein, along the second preset direction, at least one end of the housing is formed with an opening, and the cover plate is installed at at least one opening of the housing, and the cover plate is formed with a conductive protrusion protruding toward the side opposite to the electrode assembly.

[0020] In any of the above technical solutions, the supporting member and the spacer member are both made of insulating material.

[0021] In any of the above technical solutions, further, along the second preset direction, a cover plate is installed at both openings of the housing, and an explosion-proof valve is installed on each of the cover plates.

[0022] Compared with the prior art, the beneficial effects of this application are as follows:

[0023] This application provides a longer battery cell, thereby achieving an overall increase in capacity. Furthermore, the internal electrode assembly of the battery cell is designed as a split structure, reducing the length of a single electrode assembly, i.e., reducing the length of the electrode sheet. This reduces the likelihood of wrinkles, deformation, delamination, or breakage during electrode sheet production and subsequent assembly, thus improving yield and reducing costs. Moreover, a spacer between two electrode assemblies serves to insulate and separate the main body of the two electrode assemblies, and also forms a clearance channel for the tab cluster, effectively preventing damage to the tabs and improving overall strength. Preferably, the ends of the electrode assemblies have grooves to avoid the tab clusters, providing space for them and preventing interference. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 An exploded view of the battery cell provided in the embodiments of this application;

[0026] Figure 2 Another exploded view of the battery cell provided in the embodiments of this application;

[0027] Figure 3 A partial exploded view of the battery cell provided in the embodiments of this application;

[0028] Figure 4 for Figure 3 A magnified structural diagram at point A;

[0029] Figure 5 Assembly drawings of the support members, spacers, and support end plates provided in the embodiments of this application;

[0030] Figure 6 for Figure 5 A magnified structural diagram at point B;

[0031] Figure 7 for Figure 5 A magnified structural diagram at point C;

[0032] Figure 8 Another assembly drawing of the support member, spacer member, and support end plate provided in the embodiments of this application;

[0033] Figure 9 for Figure 8 A magnified structural diagram at point D;

[0034] Figure 10 This is a schematic diagram of the structure of the spacer provided in the embodiments of this application;

[0035] Figure 11 This is another structural schematic diagram of the spacer member provided in an embodiment of this application;

[0036] Figure 12 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this application;

[0037] Figure 13 This is a schematic diagram of the pole assembly provided in an embodiment of this application;

[0038] Figure 14 for Figure 13 A magnified structural diagram at point E;

[0039] Figure 15 This is a schematic diagram of the connection between two pole groups provided in an embodiment of this application.

[0040] Figure label:

[0041] 1-Pole assembly, 11-Pole group, 111-Allowing groove, 112-Pole lug cluster, 2-Support member, 21-Slot, 22-Protrusion, 3-Spacer member, 31-Mounting port, 32-Slit, 4-Protective plate, 5-Support end plate, 51-Through hole, 6-Insulating film, 7-Housing, 8-Cover plate, 81-Conductive protrusion. Detailed Implementation

[0042] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0043] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0044] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] The following reference Figures 1 to 15 This application describes a battery cell according to some embodiments.

[0048] See Figures 1 to 9 , Figures 13 to 15 As shown, an embodiment of this application provides a battery cell, including: an electrode assembly 1, a support member 2, and a spacer member 3; wherein, along a first preset direction a, at least one side of the electrode assembly 1 is provided with the support member 2, and the spacer member 3 is connected to the support member 2.

[0049] The pole assembly 1 includes a plurality of pole groups 11 arranged sequentially along a second preset direction b, and at least one of the two adjacent ends of any two adjacent pole groups 11 forms a clearance groove 111, and the pole tab cluster 112 of the pole group 11 is disposed in the corresponding clearance groove 111.

[0050] A spacer 3 is provided between any two adjacent pole groups 11. The spacer 3 forms an installation port 31, and the pole tab cluster 112 of the pole group 11 can extend through the installation port 31 into the clearance groove 111 of the adjacent pole group 11.

[0051] As can be seen from the structure described above, this application provides a longer battery cell, thereby achieving an overall increase in capacity. Furthermore, the overall electrode group 11 inside the battery cell is designed as a split structure, thereby reducing the length of a single electrode group 11, that is, reducing the length of the electrode sheet. This makes it less likely for problems such as wrinkles, deformation, delamination, or breakage to occur during electrode sheet production and subsequent assembly, thus helping to improve the yield rate and reduce costs. Moreover, the spacer member 3 is provided between the two electrode groups 11, which serves to insulate and separate the main body parts of the two electrode groups 11 and also forms a clearance channel for the tab cluster 112, which can effectively prevent defects such as tab damage and improve the overall strength. Preferably, the end of the electrode group 11 is formed with a groove, which serves to avoid the tab cluster 112 and provides space for accommodating the tab cluster 112, avoiding interference.

[0052] Furthermore, preferably, the first preset direction a can be the width direction of the pole group 11, but of course, it is not limited to this.

[0053] Furthermore, preferably, the second preset direction b can be the length direction of the pole group 11, but of course, it is not limited to this.

[0054] Furthermore, preferably, the support member 2 is disposed on the narrow side of the pole assembly 11. This narrow side specifically refers to the side with a smaller area formed by the long side and the wide side, which improves the convenience of inserting the pole assembly 11 into the shell, and of course, it is not limited to this.

[0055] Furthermore, preferably, the support member 2 and the spacer member 3 are both made of insulating material to avoid short circuits, which is a basic requirement of batteries and will not be described in detail here.

[0056] Furthermore, preferably, support members 2 are provided on both sides of the pole assembly 1 along the first preset direction a. This will be used as an example for explanation later. Of course, it is not limited to this. Alternatively, the aforementioned support members 2 may be provided on only one side of the pole assembly 1 along the first preset direction a.

[0057] It should be noted that: along the first preset direction a, the two adjacent pole groups 11 and the two sides of the spacer 3 between them abut together, or a small gap may be left, depending on the actual needs.

[0058] In this embodiment, preferably, as follows: Figures 1 to 6 As shown, along the third preset direction, at least one side wall of the clearance groove 111 is formed with a clearance opening; the battery cell also includes a protective sheet 4, and along the third preset direction, at least one side of the electrode group 11 is provided with a protective sheet 4, and the protective sheet 4 covers the clearance opening.

[0059] As can be seen from the structure described above, the protective sheet 4 is used to shield the electrode tabs, thereby protecting them. Preferably, the protective sheet 4 is made of insulating material, which is a basic requirement of batteries and will not be described in detail here.

[0060] In this embodiment, preferably, as follows: Figure 5 and Figure 6 As shown, the spacer 3 and the support 2 are detachably connected, so the assembly of the two is repeatable and easier to adjust.

[0061] In this embodiment, preferably, as follows: Figure 6 and Figure 9 As shown, the support member 2 has a slot 21, and the spacer member 3 has a plug-in part, which is inserted into the slot 21.

[0062] As can be seen from the structure described above, by inserting the plug into the slot 21, the spacer 3 is fixed to the side of the support member 2. Moreover, the assembly process is simple, convenient, time-saving and labor-saving. In addition, the support member 2 has a large area, which makes it easy to set the slot 21. The spacer 3 has a small width, which makes it difficult to set the slot 21.

[0063] Furthermore, preferably, along the first preset direction a, one side of the spacer member 3 is the aforementioned insertion part, but of course, it is not limited to this.

[0064] It should be noted that the structure is not limited to the above. Alternatively, the spacer member 3 can have a slot 21, and the support member 2 can have a plug-in portion, with the plug-in portion inserted into the slot 21. The specific choice depends on actual needs. Furthermore, the connection method between the spacer member 3 and the support member 2 is not limited to the above; it can also be achieved through snap-fitting, adhesive bonding, or heat fusion.

[0065] In this embodiment, preferably, as follows: Figure 5 and Figure 7 As shown, the battery cell also includes a support end plate 5, and along the second preset direction b, both ends of the electrode assembly 1 are provided with support end plates 5, and the support end plates 5 are connected to the support member 2; the support end plates 5 form through holes 51, which serve to lead out the tab cluster 112.

[0066] As can be seen from the structure described above, support end plates 5 are set at both ends of the pole assembly 1 to ensure that the thrust is balanced when the pole assembly 11 is inserted into the shell. The two support end plates 5 connect the two support members 2 into one, forming a frame, which helps to improve the overall strength and provides better protection for the pole assembly 1.

[0067] Furthermore, preferably, the material of the support end plate 5 is an insulating material such as rubber or plastic, which is a basic requirement for batteries and will not be described in detail here.

[0068] It should be noted that: it is not limited to providing support end plates 5 at both ends of the pole group 11, but also to providing insulating support plates at only one end of the pole group assembly 1 along the second preset direction b, depending on the actual needs of the design.

[0069] In this embodiment, preferably, as follows: Figure 5 As shown, the support end plate 5 and the support component 2 are an integral injection-molded structure, which has high overall strength, strong resistance to deformation, good protection for the pole assembly 11, and is easy to mold. Of course, it is not limited to the above molding method. The support end plate 5 and the support component 2 can also be independent structural parts, which can be assembled together later, for example, by hot melting, gluing or snap-fitting.

[0070] In this embodiment, preferably, as follows: Figure 1 and Figure 2 As shown, the battery cell also includes an insulating film 6, which wraps around the outside of the entire assembly of the electrode assembly 1, the spacer 3, the support member 2, and the support end plate 5. Along the first preset direction a, at least one end of the insulating film 6 is open, which can avoid the tab cluster 112, facilitate the venting during thermal runaway, and facilitate liquid injection, etc.

[0071] As can be seen from the structure described above, a Mylar film is wrapped around the outside of the entire assembly, including the pole assembly 1, the spacer 3, the support member 2, and the support end plate 5, to improve the insulation protection capability.

[0072] In this embodiment, preferably, the support end plate 5 is connected to the adjacent pole group 11 by thermal fusion.

[0073] As can be seen from the structure described above, the support end plate 5 is connected to the adjacent pole group 11 by thermal fusion, which makes the support end plate 5 difficult to move, ensures the thrust balance when the pole group 11 enters the shell, and can better protect the pole group 11. Moreover, the above connection method is simple and convenient to operate.

[0074] Of course, this is not the only option; the support end plate 5 and the pole group 11 can also be connected by adhesive or without any connection.

[0075] In this embodiment, preferably, as follows: Figure 10 and Figure 11 As shown, the spacer member 3 has a cutout 32, and is connected to the mounting opening 31 and the outside along both ends of the cutout 32, respectively, and the electrode tab cluster 112 of the electrode group 11 can move into the mounting opening 31 through the cutout 32.

[0076] As can be seen from the structure described above, the tab cluster 112 of the electrode group 11 can be moved into the mounting port 31 through the side cutout 32, which improves the ease of assembly.

[0077] Furthermore, preferably, the width of the cut 32 is F, and 0.5mm < F < 2mm.

[0078] In this embodiment, preferably, as follows: Figure 4 , Figures 13 to 15 As shown, both ends of any two adjacent pole groups 11 that are close to each other are formed with clearance grooves 111, so that the pole lugs 112 at the ends of the two pole groups 11 can extend into the clearance grooves 111 opposite each other through the mounting openings 31 on the spacer member 3, which can effectively prevent interference.

[0079] It should be noted that, not limited to the above structure, it is also possible to provide a clearance groove 111 at only one end of any two adjacent pole groups 11 that are close to each other. That is, only one pole group 11 has a clearance groove 111 at its end, while the other pole group 11 does not have a groove at its end. For the pole group 11 with the clearance groove 111, the pole tabs of the pole group 11 are hidden in the clearance groove 111 and do not protrude from the opening end of the clearance groove 111 to avoid interference. Furthermore, the pole tab cluster 112 of the other pole group 11 extends into the opposite clearance groove 111 through the mounting port 31 on the spacer member 3, which can also realize the docking assembly of the two pole groups 11.

[0080] In this embodiment, preferably, as follows: Figure 4 and Figure 8 As shown, a plurality of protrusions 22 are formed on one side of the support member 2 away from the pole group 11, and the plurality of protrusions 22 are arranged sequentially at intervals along the second preset direction b.

[0081] As can be seen from the structure described above, an air guide channel is formed on the outer periphery of the protrusion 22 to facilitate exhaust during thermal runaway. It can be seen that a connected air guide channel is formed on the entire outer periphery of the frame composed of the support member 2 and the support end plate 5. Furthermore, the air guide channels on both sides of the frame can be connected together through the gap at the junction of the two pole groups 11, which further improves the exhaust efficiency during thermal runaway.

[0082] In this embodiment, preferably, as follows: Figure 6 As shown, one of the two adjacent pole groups 11 has a positive electrode lug 112 at its two ends that are close to each other, and the other has a negative electrode lug 112. The positive electrode lug 112 and the negative electrode lug 112 are stacked together and connected by welding.

[0083] As can be seen from the structure described above, the tab clusters 112 of the two pole groups 11 are directly connected together, reducing the number of intermediate connectors, further reducing the internal resistance, saving the length of the tab clusters 112, reducing the internal space of the cell, and the tab clusters 112 of the two pole groups 11 adopt a horizontal welding method, which simplifies the process.

[0084] In this embodiment, preferably, as follows: Figure 1 and Figure 12 As shown, the battery cell also includes a housing 7 and a cover plate 8; wherein, along the second preset direction b, at least one end of the housing 7 is formed with an opening, and the cover plate 8 is installed at at least one opening of the housing 7, and the cover plate 8 is formed with a conductive protrusion 81 protruding toward the side opposite to the electrode assembly 1.

[0085] As can be seen from the structure described above, other cover plate components 8 have been eliminated, leaving only the metal cover plate 8. A conductive protrusion 81 protruding outward is provided on the cover plate 8 as an energy output terminal, which has high space utilization and helps to increase the capacity of the battery cell. Furthermore, an insulating support plate 5 is provided below the cover plate 8 to prevent short circuits and other problems, making it safer and more reliable.

[0086] Furthermore, preferably, the material of the cover plate 8 can be aluminum. Of course, it is not limited to this. The material of the cover plate 8 can also be other materials, such as copper-aluminum composite plate, etc. Moreover, the material selection of the cover plate 8 is different for different batteries. For example, for sodium batteries, both cover plates 8 are made of aluminum, while for lithium batteries, one cover plate 8, that is, the positive electrode cover plate 8, is aluminum, and the other cover plate 8, that is, the negative electrode cover plate 8, is made of copper-aluminum composite material, etc.

[0087] In addition, it should be noted that when both ends of the pole assembly 1 are equipped with insulating support end plates 5, that is, when there are two support end plates 5, only one support end plate 5 can be selected, and a cover plate 8 can be set on its outer side, while the outer side of the other support end plate 5 can be equipped with the cover plate 8 structure commonly used in the prior art, or both support end plates 5 can be equipped with the aforementioned cover plate 8, depending on the actual needs.

[0088] In this embodiment, preferably, as follows: Figure 1 As shown, along the second preset direction b, a cover plate 8 is installed at both openings of the housing 7, and an explosion-proof valve is installed on each cover plate 8.

[0089] As can be seen from the structure described above, explosion-proof valves are installed on both cover plates 8, which can exhaust gas at both ends of the pole assembly 1, improve the exhaust rate during thermal runaway, and effectively suppress thermal runaway.

[0090] In this embodiment, preferably, as follows: Figure 5 As shown, the support member 2 is a flat plate structure extending along the second preset direction b, that is, the length direction of the pole group 11, and a protrusion 22 is provided on the side opposite to the pole group 11. Of course, it is not limited to this.

[0091] In this embodiment, preferably, as follows: Figure 5As shown, the spacer member 3 is a flat plate structure, which can effectively block two adjacent pole groups 11, and its structure is simple and easy to process and manufacture. Of course, it is not limited to this.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: The pole assembly includes a pole piece, a support member, and a spacer member; wherein, along a first preset direction, at least one side of the pole assembly is provided with the support member, and the spacer member is connected to the support member; The pole assembly includes a plurality of pole groups arranged sequentially along a second preset direction, and at least one of the two ends of any two adjacent pole groups that are close to each other forms an avoidance groove, and the pole tab cluster of the pole group is disposed in the corresponding avoidance groove. The spacer member is provided between any two adjacent pole groups, the spacer member having an installation opening, and the pole tab cluster of the pole group can extend through the installation opening into the clearance groove of the adjacent pole group.

2. The battery cell according to claim 1, characterized in that, Along a third preset direction, at least one side wall of the avoidance groove is formed with an avoidance opening; the battery cell also includes a protective sheet, and along the third preset direction, at least one side of the electrode group is provided with the protective sheet, and the protective sheet covers the avoidance opening.

3. The battery cell according to claim 1, characterized in that, The spacer member and the support member are detachably connected.

4. The battery cell according to claim 3, characterized in that, One of the spacer member and the support member has a slot, and one of the spacer member and the support member has a plug-in portion, which is inserted into the slot.

5. The battery cell according to claim 1, characterized in that, The battery cell also includes a support end plate, and the support end plate is provided at least one end of the electrode assembly along the second preset direction, and the support end plate is connected to the support member; The support end plate has a through hole.

6. The battery cell according to claim 5, characterized in that, The supporting end plate and the supporting component are an integral injection-molded structure; and / or The battery cell further includes an insulating film, which wraps around the entire assembly of the electrode assembly, the supporting member, the spacer member, and the supporting end plate, and at least one end of the insulating film is open along the second preset direction; and / or The support end plate is connected to the adjacent pole group by thermal fusion; and / or The support end plate is made of insulating material.

7. The battery cell according to claim 1, characterized in that, The spacer member has a slit, and both ends of the slit are connected to the mounting opening and the outside, respectively, and the electrode lugs of the electrode assembly can move into the mounting opening through the slit; and / or Alignment grooves are formed at the two ends of any two adjacent pole groups that are close to each other.

8. The battery cell according to claim 1, characterized in that, The supporting member has a plurality of protrusions on the side opposite to the pole group, and the plurality of protrusions are sequentially spaced along the second preset direction; and / or One of the two adjacent pole groups has a positive electrode lug at its two ends, and the other has a negative electrode lug. The positive electrode lug and the negative electrode lug are stacked together and connected by welding.

9. The battery cell according to claim 1, characterized in that, The battery cell further includes a housing and a cover plate; wherein, along the second preset direction, at least one end of the housing has an opening, and the cover plate is installed at at least one opening of the housing, and the cover plate has a conductive protrusion protruding toward the side opposite to the electrode assembly; and / or Both the supporting member and the spacer member are made of insulating material.

10. The battery cell according to claim 9, characterized in that, Along the second preset direction, a cover plate is installed at both openings of the housing, and an explosion-proof valve is installed on each of the cover plates.

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