Pole core, battery and electric equipment

Abstract

The utility model provides a pole core, a battery and electric equipment. The pole core comprises a plurality of pole pieces arranged at intervals along a first direction and at least two tabs connected with the plurality of pole pieces, the pole core comprises a first side face and a second side face which are opposite in the second direction and a third side face and a fourth side face which are opposite in the third direction, the length of the first side face in the third direction is smaller than that of the third side face in the second direction, and the two tabs are arranged on at least one of the third side face and the fourth side face; the tab comprises a connecting piece, a first conductive piece and a second conductive piece, the connecting piece is connected with the pole piece, the first conductive piece and the second conductive piece are connected with the two ends of the connecting piece respectively, the second end of the first conductive piece is bent towards the second conductive piece, and the second end of the second conductive piece is bent towards the first conductive piece; and the first conductive sheet, the second conductive sheet and the connecting sheet are laminated. According to the invention, the energy density of the battery is improved, and the phenomenon of uneven heating of the pole piece is reduced.

Description

Technical Field

[0001] The present application relates to battery manufacturing technology, and in particular to a pole core, a battery and an electrical device. Background Art

[0002] As environmental and energy issues become increasingly prominent, the new energy industry is ushering in a golden period of vigorous development. As an important part of the new energy industry, battery technology innovation is changing with each passing day, constantly promoting the progress and upgrading of the industry.

[0003] In the scheme of the related technology, the battery includes an outer shell and a pole core arranged in the outer shell. The pole core is generally rectangular and includes two pole ears. The two pole ears are respectively arranged on two shorter sides of the pole core. The pole ears pass through the outer shell through the pole column and are connected to the corresponding terminal. The battery is connected to the external device through the terminal.

[0004] However, in the solution using the related technology, the pole ear occupies a large volume in the shell, which is not conducive to improving the energy density of the battery; and arranging the pole ear on the side of the pole core with a shorter length will cause uneven heating of the pole piece, thereby affecting the normal use of the battery. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the related art, the purpose of the present application is to provide a pole core, a battery and an electrical equipment. The present application is conducive to reducing the volume occupied by the pole ear in the outer shell, thereby helping to improve the energy density of the battery; the present application is also conducive to reducing the phenomenon of uneven heating of the pole piece, thereby ensuring the normal use of the battery.

[0006] In one aspect, the present application provides a pole core, comprising a plurality of pole pieces spaced apart along a first direction and at least two pole ears connected to the plurality of pole pieces; the pole core comprises a first side surface and a second side surface opposite to each other along a second direction and a third side surface and a fourth side surface opposite to each other along a third direction, the length of the first side surface along the third direction being shorter than the length of the third side surface along the second direction, and the two pole ears being arranged on at least one of the third side surface and the fourth side surface;

[0007] The pole ear includes a connecting plate, a first conductive plate and a second conductive plate, the connecting plate is connected to the pole plate, the first end of the first conductive plate is connected to the first end of the connecting plate, the first end of the second conductive plate is connected to the second end of the connecting plate, the second end of the first conductive plate is bent toward the second conductive plate, the second end of the second conductive plate is bent toward the first conductive plate, and at least part of the first conductive plate, at least part of the second conductive plate and the connecting plate are stacked.

[0008] In a possible implementation manner, at least a portion of the first conductive sheet overlaps with the second conductive sheet.

[0009] In a possible implementation, both of the two tabs are disposed on the third side surface or the fourth side surface; the pole core further includes at least two pole columns, and the two pole columns correspond to the two tabs one by one.

[0010] In a possible implementation, a cavity is formed between the first conductive sheet and the second conductive sheet and the connecting sheet, and a conductive member is disposed in the cavity. A first side of the conductive member is connected to one of the first conductive sheet and the second conductive sheet, and a second side of the conductive member is connected to the connecting sheet.

[0011] In a possible implementation, the two tabs include a first tab and a second tab. The first tab and the second tab are both disposed on the third side surface or the fourth side surface, and the first tab is disposed close to the first side surface, and the second tab is disposed close to the second side surface; the pole core further includes at least two pole columns, and the two pole columns include a first pole column and a second pole column. The first pole column is disposed on the first side surface, and the first pole column is connected to the first tab through a first current-carrying sheet. The second pole column is disposed on the second side surface, and the second pole column is connected to the second tab through a second current-carrying sheet.

[0012] In a possible implementation, the two tabs include a first tab and a second tab. The first tab is disposed on the third side surface, and the second tab is disposed on the fourth side surface; the pole core further includes at least two pole columns, and the two pole columns include a first pole column and a second pole column. The first pole column is disposed on the first side surface, and the first pole column is connected to the first tab through a first current-carrying sheet. The second pole column is disposed on the second side surface, and the second pole column is connected to the second tab through a second current-carrying sheet.

[0013] In a possible implementation, the plurality of pole pieces include several first pole pieces and several second pole pieces, and the several first pole pieces and the several second pole pieces are arranged at intervals in an alternating manner along the first direction; the first pole piece is provided with a first convex portion, the second pole piece is provided with a second convex portion, and the first convex portion and the second convex portion are arranged at intervals in an alternating manner along the second direction;

[0014] The two tabs include a first tab and a second tab. The first tab is connected to the several first convex portions, and the second tab is connected to the several second convex portions.

[0015] In a possible implementation, the multiple pole pieces include several first pole pieces and several second pole pieces, and the several first pole pieces and the several second pole pieces are arranged at intervals in an alternating manner along the first direction; the first pole piece is provided with a first protruding portion, the second pole piece is provided with a second protruding portion, the first protruding portion is arranged on a first side of the first pole piece along the third direction, and the second protruding portion is arranged on a second side of the second pole piece along the third direction;

[0016] The two pole tabs include a first pole tab and a second pole tab, the first pole tab is connected to the several first protruding portions, and the second pole tab is connected to the several second protruding portions.

[0017] On the other hand, the present application provides a battery, including a housing, a cavity is formed inside the housing, and the above-mentioned pole core is arranged inside the cavity.

[0018] On yet another aspect, the present application provides an electrical device, including the above-mentioned battery.

[0019] The present application provides a pole core, a battery and an electrical device. The pole core includes a plurality of pole pieces arranged at intervals along a first direction and at least two pole tabs connected to the plurality of pole pieces; the pole core includes a first side surface and a second side surface opposite to each other along a second direction and a third side surface and a fourth side surface opposite to each other along a third direction. The length of the first side surface along the third direction is less than the length of the third side surface along the second direction. The two pole tabs are arranged on at least one of the third side surface and the fourth side surface; the pole tab includes a connecting piece, a first conductive piece and a second conductive piece. The connecting piece is connected to the pole piece. The first end of the first conductive piece is connected to the first end of the connecting piece. The first end of the second conductive piece is connected to the second end of the connecting piece. The second end of the first conductive piece is bent towards the second conductive piece, and the second end of the second conductive piece is bent towards the first conductive piece, and at least part of the first conductive piece, at least part of the second conductive piece and the connecting piece are arranged in a stacked manner. By arranging the pole tabs of the pole core on the third side surface and / or the fourth side surface with a longer length, the present application reduces the length of the current flow path in the pole piece, which is beneficial to reducing the heat generation of the pole piece; in addition, before assembling the pole core with the housing of the battery, by setting the pole tab to include a connecting piece, a first conductive piece and a second conductive piece, and making the first conductive piece and the second conductive piece both bend towards each other and be arranged in a stacked manner with the connecting piece, the setting of the spacer in the related art is cancelled, the volume occupied by the pole tab is reduced, and it is beneficial to improve the energy density of the battery. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present application or in the related art, the following will briefly introduce the drawings required for the description of the embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the structure of a battery in the related art;

[0022] Figure 2 It is a schematic diagram of the connection structure between the tab and the outer shell in the related art;

[0023] Figure 3 It is a schematic diagram of the structure of a battery provided by an embodiment of the present application;

[0024] Figure 4 It is Figure 3 A schematic diagram of the structure after hiding part of the outer shell;

[0025] Figure 5(a) - Figure 5(d) It is a process diagram of the preparation of the tab provided by an embodiment of the present application;

[0026] Figure 6 It is an exploded view of the connection structure between the tab and the outer shell provided by an embodiment of the present application;

[0027] Figure 7 It is a schematic diagram of the connection structure between the tab and the outer shell provided by an embodiment of the present application;

[0028] Figure 8 It is a schematic diagram of the structure of a battery provided by another embodiment of the present application;

[0029] Figure 9 It is Figure 8 A schematic diagram of the structure after hiding part of the structure;

[0030] Figure 10 It is a schematic diagram of the structure of the tab provided by an embodiment of the present application;

[0031] Figure 11 It is an exploded view of the connection structure between the tab and the outer shell provided by another embodiment of the present application;

[0032] Figure 12 It is a schematic diagram of the tab arrangement structure provided by an embodiment of the present application;

[0033] Figure 13 It is a schematic diagram of the structure of a battery provided by still another embodiment of the present application;

[0034] Figure 14 It is Figure 13 A schematic diagram of the structure after hiding part of the structure.

[0035] Reference numerals:

[0036] 10 - electrode core; 11 - first side; 12 - second side; 13 - third side; 14 - fourth side;

[0037] 100 - tab; 101 - connecting piece; 102 - first conductive piece; 103 - second conductive piece; 104 - conductive member; 110 - first tab; 120 - second tab;

[0038] 200 - terminal; 210 - first terminal; 220 - second terminal; 230 - first current - guiding piece; 240 - second current - guiding piece;

[0039] 310 - first electrode plate; 311 - first convex portion; 320 - second electrode plate; 321 - second convex portion;

[0040] 20 - housing; 21 - cover plate; 211 - first cover plate; 212 - second cover plate; 23 - first terminal; 231 - first terminal insulating member; 232 - first insulating rubber ring; 24 - second terminal; 241 - second terminal insulating member; 242 - second insulating rubber ring; 25 - top spacer ring;

[0041] 31 - current - leading - out piece; 32 - spacer ring;

[0042] X - first direction; Y - second direction; Z - third direction. Detailed implementation manners

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some, but not all, of the embodiments of this application.

[0044] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0045] As described in the background art, the batteries in the solutions of the related art have problems such as a relatively large volume occupied by the tabs and uneven heat generation of the electrode plates.

[0046] Such as Figure 1 and Figure 2As shown, specifically, the battery in the related art includes a housing 20 and an electrode core disposed within the housing. The electrode core is generally rectangular parallelepiped-shaped and includes two tab ears 100. The two tab ears 100 are respectively disposed on two shorter side surfaces of the electrode core. It can be understood that one of the two tab ears 100 is a positive tab ear and the other is a negative tab ear. Since the tab ears 100 are disposed on the shorter side surfaces, the current will flow along the longer side surface of the electrode core in the electrode plate of the electrode core. The longer the current flow path, the greater the resistance it encounters. Therefore, there is a problem of uneven heat generation in the electrode plate in this solution.

[0047] The housing 20 further includes a first cover plate 211 and a second cover plate 212. The first cover plate 211 covers the positive tab ear, and the second cover plate 212 covers the negative tab ear. Since the structures of the positive tab ear and the negative tab ear are completely the same, the connection structure between the positive tab ear and the first cover plate 211 will be taken as an example for illustration below.

[0048] As Figure 2 shown, the tab ear 100 connected to the electrode plate is connected to the first pole column 210 through a current lead-out piece 31. The first pole column 210 is a positive pole column. The first pole column 210 passes through the first cover plate 211, and after passing through the first cover plate 211, it is connected to the first terminal 23. It can be understood that the first terminal 23 is a positive terminal. To ensure sealing and insulation, a first terminal insulating member 231 is provided between the first terminal 23 and the first cover plate 211, and a first insulating rubber ring 232 is provided between one side of the first pole column 210 located within the first cover plate 211 and the first cover plate 211. A spacer 32 is also provided between the electrode plate and the first cover plate 211. The spacer 32 can gather the tab ears 100 connecting multiple electrode plates together and limit and fix the tab ears 100. During preparation, the tab ear 100 can be first pulled out of the first cover plate 211, then the tab ear 100 is welded to the first pole column 210, and after welding, the tab ear 100 is pressed into the first cover plate 211. Obviously, due to the existence of the spacer 32, the distance between the electrode plate and the first cover plate 211 is increased, thereby increasing the volume occupied within the housing 20, which is not conducive to improving the energy density of the battery.

[0049] In view of this, the embodiments of the present application aim to provide an electrode core, a battery, and an electrical device. By disposing the tab ears of the electrode core on the side surface with a longer length, the length of the current flow path in the electrode plate is reduced, which is beneficial to reducing the heat generation of the electrode plate. In addition, before assembling the electrode core and the housing of the battery, by setting the tab ears to include a connecting piece, a first conductive piece, and a second conductive piece, and making the first conductive piece and the second conductive piece both bend towards each other, the setting of the spacer in the related art is cancelled, and the volume occupied by the tab ears is reduced, which is beneficial to improving the energy density of the battery.

[0050] The content of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can understand the content of the present application in more detail. It should be noted that in the description of this embodiment, the first direction X, the second direction Y, and the third direction Z are three different directions in a three-dimensional space. For example, the first direction X, the second direction Y, and the third direction Z can be perpendicular to each other in pairs.

[0051] Please refer to Figure 3 , Figure 4 , Figure 8 , Figure 9 , Figure 13 and Figure 14 , this embodiment provides a battery, including a housing 20. A cavity is formed inside the housing 20, and an electrode core 10 is provided inside the cavity.

[0052] Specifically, the electrode core 10 includes a plurality of electrode plates (not shown in the figure) arranged at intervals along the first direction X. The polarities of two adjacent electrode plates are opposite, and two adjacent electrode plates can be separated by a separator. The plurality of electrode plates are connected with at least two electrode tabs 100. The two electrode tabs 100 can be a positive electrode tab and a negative electrode tab respectively, and their structures are the same.

[0053] The electrode core 10 of this embodiment is generally rectangular, including a first side surface 11 and a second side surface 12 opposite to each other along the second direction Y, and a third side surface 13 and a fourth side surface 14 opposite to each other along the third direction Z. Obviously, the length of the first side surface 11 along the third direction Z is equal to the length of the second side surface 12 along the third direction Z, and the length of the third side surface 13 along the second direction Y is equal to the length of the fourth side surface 14 along the second direction Y; and, the length of the first side surface 11 along the third direction Z is less than the length of the third side surface 13 along the second direction Y. In this embodiment, the two electrode tabs 100 are provided on at least one of the third side surface 13 and the fourth side surface 14; that is to say, the two electrode tabs 100 can be both provided on the third side surface 13 or the fourth side surface 14, or the two electrode tabs 100 can be respectively provided on the third side surface 13 and the fourth side surface 14.

[0054] With the above structure, in this embodiment, the current flows through the electrode tab 100 in the electrode plate along the third direction Z. Compared with the solution in the related art (the current flows through the electrode tab 100 in the electrode plate along the second direction Y), the length of the current flow path in the electrode plate in this embodiment is significantly shortened, which is beneficial to reducing the phenomenon of uneven heating of the electrode plate and ensuring the normal use of the battery.

[0055] Please refer to Figure 5(d) and Figure 7, in this embodiment, the tab 100 and multiple electrode plates can be integrally formed. The tab 100 includes a connecting piece 101, a first conductive piece 102, and a second conductive piece 103. Among them, the connecting piece 101 is connected to multiple electrode plates with the same polarity. The first end of the first conductive piece 102 is connected to the first end of the connecting piece 101, and the first end of the second conductive piece 103 is connected to the second end of the connecting piece 101. Moreover, the second end of the first conductive piece 102 is bent towards the second conductive piece 103, and the second end of the second conductive piece 103 is bent towards the first conductive piece 102, and at least part of the first conductive piece 102, at least part of the second conductive piece 103, and the connecting piece 101 are stacked, thereby reducing the volume occupied by the tab 100.

[0056] When preparing the tab 100 of this embodiment, it can be referred to Figure 5(a) - Figure 5(d) as shown. Specifically, as shown in Fig. 5(a), first, the tab raw materials led out from multiple electrode plates with the same polarity are gathered on the same side of the electrode core 10, and the multiple tab raw materials are extruded from the middle to form the structure of the connecting piece 101, the first conductive piece 102, and the second conductive piece 103. At this time, the first conductive piece 102 and the second conductive piece 103 are respectively located at both ends of the connecting piece 101, and both the first conductive piece 102 and the second conductive piece 103 are arranged along the length direction of the electrode plate. As shown in Figs. 5(b) and 5(c), then, the first conductive piece 102 is bent towards the second conductive piece 103 so that the first conductive piece 102 is substantially parallel to the connecting piece 101. As shown in Figs. 5(c) and 5(d), finally, the second conductive piece 103 is bent towards the first conductive piece 102 so that the second conductive piece 103 is also substantially parallel to the connecting piece 101. A certain space can be formed between the first conductive piece 102 and the second conductive piece 103 and the connecting piece 101 to facilitate the placement of the conductive member, thereby increasing the cross-sectional area of the tab 100 and improving its current-carrying capacity. Or, according to needs, the first conductive piece 102 can be abutted against the connecting piece 101 to further reduce the space occupied by the tab 100.

[0057] It can be understood that compared with the solution in the related art, in this embodiment, the tab 100 can be processed before the electrode core 10 is placed into the outer shell 20. Therefore, there is no need to set a spacer 32, thereby reducing the volume occupied by the tab 100 and being beneficial to improving the energy density of the battery.

[0058] In summary, in this embodiment, by arranging the tab 100 of the electrode core 10 on the third side 13 and / or the fourth side 14 with a longer length, the length of the current flow path in the electrode sheet is reduced, which is beneficial to reducing the heat generation of the electrode sheet. In addition, before assembling the electrode core 10 with the battery housing 20, by arranging the tab 100 to include a connecting piece 101, a first conductive sheet 102, and a second conductive sheet 103, and making the first conductive sheet 102 and the second conductive sheet 103 both bend towards each other, the volume occupied by the tab 100 is reduced, which is beneficial to improving the energy density of the battery.

[0059] Please continue to refer to FIG. 5(d) and Figure 7 , in this embodiment, at least part of the first conductive sheet 102 overlaps with the second conductive sheet 103, thereby increasing the cross-sectional area of the tab 100, improving the current-carrying capacity of the tab 100, and thus being beneficial to improving the charging efficiency of the battery.

[0060] Please continue to refer to Figure 3 , Figure 4 , Figure 6 and Figure 7 , in a possible implementation manner, the two tabs 100 of this embodiment are both arranged on the third side 13 or the fourth side 14. The electrode core 10 further includes at least two electrode posts 200, and the two electrode posts 200 correspond to the two tabs 100 one by one.

[0061] Specifically, the two tabs 100 include a first tab 110 and a second tab 120. The first tab 110 can be, for example, a positive tab, and the second tab 120 can be, for example, a negative tab. Both the first tab 110 and the second tab 120 are arranged on the third side 13. Correspondingly, the two electrode posts 200 include a first electrode post 210 and a second electrode post 220. The first electrode post 210 can be, for example, a positive electrode post, and the second electrode post 220 can be, for example, a negative electrode post. The first electrode post 210 is electrically connected to the first tab 110, and the second electrode post 220 is electrically connected to the second tab 120.

[0062] The housing 20 further includes a cover plate 21. The cover plate 21 is covered on the third side 13, and corresponding through holes are provided on the cover plate 21. After the first electrode post 210 and the second electrode post 220 pass through the through holes, they are respectively connected to the first terminal 23 and the second terminal 24; that is to say, in this embodiment, the first electrode post 210 and the second electrode post 220 can share the same cover plate 21.

[0063] In this embodiment, the connection structure between the first tab 110 and the housing is exactly the same as the connection structure between the second tab 120 and the housing. Taking the connection structure between the first tab 110 and the housing as an example, as Figure 7As shown, the first tab 110 is electrically connected to the first terminal post 210 on one side in the third direction Z. The first terminal post 210 passes through the cover plate 21 and then connects to the first terminal 23. A first terminal insulating member 231 is provided between the first terminal 23 and the cover plate 21. The portion of the first terminal post 210 located within the cover plate 21 is insulated and sealed from the cover plate 21 through a top spacer ring 25 and a first insulating rubber ring 232. In this embodiment, current flows from the first terminal post 210 to the first tab 110, or from the first tab 110 to the first terminal post 210. The current-carrying area of the first tab 110 along the current flow direction is the projected area of the first tab 110 in a plane perpendicular to the third direction Z. Therefore, the first tab 110 in this embodiment has a relatively large current-carrying area and good current-carrying capacity in the third direction Z, so there is no need to provide a conductive member within the first tab 110.

[0064] It can be understood that the second tab 120 is electrically connected to the second terminal post 220 on one side in the third direction Z. The second terminal post 220 passes through the cover plate 21 and then connects to the second terminal 24. A second terminal insulating member 241 is provided between the second terminal 24 and the cover plate 21. The portion of the second terminal post 220 located within the cover plate 21 is insulated and sealed from the cover plate 21 through a top spacer ring 25 and a second insulating rubber ring 242. In this embodiment, current flows from the second terminal post 220 to the second tab 120, or from the second tab 120 to the second terminal post 220. The current-carrying area of the second tab 120 along the current flow direction is the projected area of the second tab 120 in a plane perpendicular to the third direction Z. Therefore, the second tab 120 in this embodiment has a relatively large current-carrying area and good current-carrying capacity in the third direction Z, so there is no need to provide a conductive member within the second tab 120.

[0065] In other possible embodiments, due to changes in the current-carrying area of the tab 100, it may be necessary to increase the cross-sectional area of the tab 100 in the corresponding direction to improve the current-carrying capacity of the tab 100. Specifically, as Figure 10 shown, a cavity is formed between the first conductive sheet 102 and the second conductive sheet 103 and the connecting piece 101. A conductive member 104 is provided within the cavity. The first side of the conductive member 104 is connected to one of the first conductive sheet 102 and the second conductive sheet 103 (e.g., by welding), and the second side of the conductive member 104 is connected to the connecting piece 101 (e.g., by welding). By providing the conductive member 104, the projected area of the tab 100 in a plane perpendicular to the second direction Y is increased, which is beneficial to improving the current-carrying capacity of the tab 100 in this direction.

[0066] Please continue to refer to Figure 8 、 Figure 9 and Figure 11, In another possible implementation, the two tabs 100 of this embodiment include a first tab 110 and a second tab 120, and both the first tab 110 and the second tab 120 are disposed on the third side 13 or the fourth side 14. Exemplarily, the first tab 110 may be a positive tab, and the second tab 120 may be a negative tab. Both the first tab 110 and the second tab 120 are disposed on the third side 13, and the first tab 110 is disposed close to the first side 11, and the second tab 120 is disposed close to the second side 12.

[0067] The electrode core 10 further includes at least two electrode posts 200. The two electrode posts 200 include a first electrode post 210 and a second electrode post 220. The first electrode post 210 may be a positive electrode post, and the second electrode post 220 may be a negative electrode post. The first electrode post 210 is disposed on the first side 11, and the first electrode post 210 is connected to the first tab 110 through a first current-carrying sheet 230. The second electrode post 220 is disposed on the second side 12, and the second electrode post 220 is connected to the second tab 120 through a second current-carrying sheet 240.

[0068] In this embodiment, the connection structure between the first tab 110 and the housing 20 is the same as that between the second tab 120 and the housing 20. Taking the connection structure between the first tab 110 and the housing 20 as an example, as Figure 11 shown, the first tab 110 is electrically connected to the first current-carrying sheet 230 on one side in the second direction Y, for example, by welding; the first current-carrying sheet 230 is electrically connected to the first electrode post 210, for example, by welding. The first electrode post 210 passes through the first cover plate 211 and then connects to the first terminal 23. A first terminal insulating member 231 is provided between the first terminal 23 and the first cover plate 211. The portion of the first electrode post 210 located within the first cover plate 211 is insulated and sealed from the cover plate 21 through a top spacer 25 and a first insulating rubber ring 232. In this embodiment, the current flows from the first electrode post 210 to the first tab 110, or from the first tab 110 to the first electrode post 210. The current-carrying area of the first tab 110 along the current flow direction is the projected area of the first tab 110 in the plane perpendicular to the second direction Y. Since the projected area of the first tab 110 in this plane is small, the Figure 10 shown tab structure can be adopted to increase the projected area of the first tab 110 in the plane perpendicular to the second direction Y by adding a conductive member 104, thereby improving its current-carrying capacity.

[0069] The connection structure between the second tab 120, the second electrode post 220 and the second cover plate 212 is the same as the above structure, and this embodiment will not elaborate on it.

[0070] Please continue to refer to Figure 12, in this embodiment, the structure of the pole piece is also improved to avoid interference with adjacent pole pieces when the lead tabs 100 are led out. Specifically, a plurality of pole pieces in this embodiment include several first pole pieces 310 and several second pole pieces 320 (only one first pole piece 310 and one second pole piece 320 are shown in the figure), and the several first pole pieces 310 and the several second pole pieces 320 are arranged alternately and spaced apart along the first direction X; it can be understood that the several first pole pieces 310 are all anode pole pieces, and the several second pole pieces 320 are all cathode pole pieces.

[0071] In this embodiment, the first pole piece 310 is provided with a first protrusion 311, and the first protrusion 311 and the first pole piece 310 can be transitioned through an arc surface. The second pole piece 320 is provided with a second protrusion 321, and the second protrusion 321 and the second pole piece 320 can be transitioned through an arc surface. As Figure 12 shown, the first protrusion 311 and the second protrusion 321 are arranged alternately along the second direction Y. The first tab 110 is connected to several first protrusions 311, and the second tab 120 is connected to several second protrusions 321.

[0072] With the above structure, when the first tab 110 is led out from the first pole piece 310 along the first direction X, it will not interfere with the adjacent second pole piece 320, and when the second tab 120 is led out from the second pole piece 320 along the first direction X, it will not interfere with the adjacent first pole piece 310.

[0073] Please continue to refer to Figure 13 and Figure 14 , in another possible implementation, the two tabs 100 in this embodiment include a first tab 110 and a second tab 120. The first tab 110 is arranged on the third side 13, and the second tab 120 is arranged on the fourth side 14.

[0074] The pole core 10 further includes at least two pole columns 200. The two pole columns 200 include a first pole column 210 and a second pole column 220. The first pole column 210 can be, for example, a positive pole column, and the second pole column 220 can be, for example, a negative pole column. The first pole column 210 is arranged on the first side 11, and the first pole column 210 is connected to the first tab 110 through a first current-carrying sheet 230. The second pole column 220 is arranged on the second side 12, and the second pole column 220 is connected to the second tab 120 through a second current-carrying sheet 240.

[0075] Compared with Figure 8 , Figure 9In the solution shown in the figure, in this embodiment, the first tab 110 and the second tab 120 are respectively arranged on the third side 13 and the fourth side 14. The lengths of the first tab 110 and the second tab 120 along the second direction Y can be substantially equal to the length of the electrode tab along the second direction Y. Thereby, it can be ensured that after the current passes through the first tab 110 and the second tab 120, it all flows along the third direction Z in the electrode tab, further reducing the length of the current flow path in the electrode tab, which is beneficial to reducing the uneven heat generation phenomenon of the electrode tab and ensuring the normal use of the battery.

[0076] In this embodiment, the connection structure between the first tab 110 and the first cover plate 211, and the connection structure between the second tab 120 and the second cover plate 212 are the same as those in the above Figure 8 、 Figure 9 and Figure 11 shown embodiments, and will not be elaborated here.

[0077] In this embodiment, the multiple electrode tabs include several first electrode tabs 310 and several second electrode tabs 320, and the several first electrode tabs 310 and the several second electrode tabs 320 are arranged alternately and spaced apart along the first direction X; it can be understood that the several first electrode tabs 310 are all anode electrode tabs, and the several second electrode tabs 320 are all cathode electrode tabs.

[0078] The first electrode tab 310 is provided with a first protrusion 311, and the second electrode tab 320 is provided with a second protrusion 321. The first protrusion 311 is arranged on the first side of the first electrode tab 310 along the third direction Z, and the second protrusion 321 is arranged on the second side of the second electrode tab 320 along the third direction Z. The two tabs 100 include a first tab 110 and a second tab 120. The first tab 110 is connected to the several first protrusions 311, and the second tab 120 is connected to the several second protrusions 321.

[0079] Through the above structure, when the first tab 110 is led out from the first electrode tab 310 along the first direction X, it will not interfere with the adjacent second electrode tab 320, and when the second tab 120 is led out from the second electrode tab 320 along the first direction X, it will not interfere with the adjacent first electrode tab 310.

[0080] This embodiment also provides an electrical device, including the battery as above. The electrical device can include a battery pack, a vehicle, or an energy storage device.

[0081] It can be understood that due to the adoption of the above battery, therefore, this embodiment can reduce the heat generation during the use of the electrical device, and improve the energy density of the battery in the electrical device, thereby improving relevant capabilities such as endurance.

[0082] In the description of the present application, it should be understood that the orientation or positional relationship indicated by 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. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.

[0083] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0084] It should be noted that in the description of the present application, the terms "first" and "second" are only used for conveniently describing different components, and should not be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0085] The embodiments or implementation manners in the present application are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the embodiments can be referred to each other.

[0086] In the description of the present application, the description referring to terms such as "one implementation manner", "some implementation manners", "illustrative implementation manner", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the implementation manner or example are included in at least one implementation manner or example of the present application. In the present application, the schematic expressions of the above terms do not necessarily refer to the same implementation manner or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more implementation manners or examples.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pole core (10), characterized in that, It includes a plurality of pole pieces arranged at intervals in a first direction and at least two pole tabs (100) connected to the plurality of pole pieces; the pole core (10) includes a first side surface (11) and a second side surface (12) opposite to each other in a second direction, and a third side surface (13) and a fourth side surface (14) opposite to each other in a third direction. The length of the first side surface (11) in the third direction is less than the length of the third side surface (13) in the second direction. The two pole tabs (100) are arranged on at least one of the third side surface (13) and the fourth side surface (14). The pole tab (100) includes a connecting piece (101), a first conductive piece (102) and a second conductive piece (103). The connecting piece (101) is connected to the pole piece. The first end of the first conductive piece (102) is connected to the first end of the connecting piece (101). The first end of the second conductive piece (103) is connected to the second end of the connecting piece (101). The second end of the first conductive piece (102) is bent towards the second conductive piece (103). The second end of the second conductive piece (103) is bent towards the first conductive piece (102). And at least part of the first conductive piece (102), at least part of the second conductive piece (103) and the connecting piece (101) are stacked.

2. The pole core (10) according to claim 1, characterized in that, At least part of the first conductive piece (102) overlaps with the second conductive piece (103).

3. The electrode core (10) according to claim 2, characterized in that, Both of the two pole tabs (100) are arranged on the third side surface (13) or the fourth side surface (14); the pole core (10) further includes at least two pole posts (200), and the two pole posts (200) correspond to the two pole tabs (100) one by one.

4. The pole core (10) according to claim 2, characterized in that, A cavity is formed between the first conductive piece (102), the second conductive piece (103) and the connecting piece (101). A conductive member (104) is arranged in the cavity. The first side of the conductive member (104) is connected to one of the first conductive piece (102) and the second conductive piece (103). The second side of the conductive member (104) is connected to the connecting piece (101).

5. The pole core (10) according to claim 4, characterized in that, The two pole tabs (100) include a first pole tab (110) and a second pole tab (120). The first pole tab (110) and the second pole tab (120) are both arranged on the third side surface (13) or the fourth side surface (14), and the first pole tab (110) is arranged close to the first side surface (11), and the second pole tab (120) is arranged close to the second side surface (12). The electrode core (10) further includes at least two electrode posts (200). The two electrode posts (200) include a first electrode post (210) and a second electrode post (220). The first electrode post (210) is disposed on the first side surface (11), and the first electrode post (210) is connected to the first tab (110) through a first current collector tab (230). The second electrode post (220) is disposed on the second side surface (12), and the second electrode post (220) is connected to the second tab (120) through a second current collector tab (240).

6. The pole core (10) according to claim 4, characterized in that, The two tabs (100) include a first tab (110) and a second tab (120). The first tab (110) is disposed on the third side surface (13), and the second tab (120) is disposed on the fourth side surface (14). The electrode core (10) further includes at least two electrode posts (200). The two electrode posts (200) include a first electrode post (210) and a second electrode post (220). The first electrode post (210) is disposed on the first side surface (11), and the first electrode post (210) is connected to the first tab (110) through a first current collector tab (230). The second electrode post (220) is disposed on the second side surface (12), and the second electrode post (220) is connected to the second tab (120) through a second current collector tab (240).

7. The pole core (10) according to claim 3 or 5, characterized in that, The multiple electrode plates include several first electrode plates (310) and several second electrode plates (320). The several first electrode plates (310) and the several second electrode plates (320) are arranged alternately and spaced apart in a first direction. The first electrode plate (310) is provided with a first protrusion (311), and the second electrode plate (320) is provided with a second protrusion (321). The first protrusion (311) and the second protrusion (321) are arranged alternately in a second direction. The two tabs (100) include a first tab (110) and a second tab (120). The first tab (110) is connected to several first protrusions (311), and the second tab (120) is connected to several second protrusions (321).

8. The electrode core (10) according to claim 6, characterized in that, The multiple electrode plates include several first electrode plates (310) and several second electrode plates (320). The several first electrode plates (310) and the several second electrode plates (320) are arranged alternately and spaced apart in a first direction. The first electrode plate (310) is provided with a first protrusion (311), and the second electrode plate (320) is provided with a second protrusion (321). The first protrusion (311) is disposed on the first side of the first electrode plate (310) along a third direction, and the second protrusion (321) is disposed on the second side of the second electrode plate (320) along the third direction. The two tabs (100) include a first tab (110) and a second tab (120). The first tab (110) is connected to several first protrusions (311), and the second tab (120) is connected to several second protrusions (321).

9. A battery, characterized in that, It includes a housing (20), a cavity is formed inside the housing (20), and an electrode core (10) as described in any one of claims 1-8 is provided inside the cavity.

10. An electrical device, characterized in that, It includes a battery as described in claim 9.

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