Battery cell

Abstract

The utility model relates to a battery core, which can reduce the length of a tab and comprises a first pole core body and a second pole core body, the first tab is connected with the first pole core body; a second pole core body; the third tab is connected with the second pole core body; the first adapter piece comprises a first connecting lug, a second connecting lug and a first connecting part arranged between the first connecting lug and the second connecting lug; the first connecting lug is connected with the first pole lug, and the second connecting lug is connected with the third pole lug.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery cells, and in particular to a battery cell. Background Art

[0002] Most current battery cells are manufactured by welding the tabs of the stacked core to the adapter at the ends, then bending them into the shell (i.e., installing them into the casing). As the thickness of the battery cell increases, the length of the tabs of the stacked core also increases. However, if the tabs are too long, they are prone to bending during the production process. Therefore, the maximum length of the tabs of the stacked core can be limited by the thickness of the battery cell. Utility Model Content

[0003] Based on this, in order to solve the problem of how to reduce the length of the tab, the present disclosure proposes a battery cell.

[0004] According to one aspect of the present disclosure, a battery cell includes: a first pole core body; a first pole lug connected to the first pole core body; a second pole core body; a third pole lug connected to the second pole core body; a first adapter plate, the first adapter plate including a first connecting lug, a second connecting lug, and a first connecting portion arranged between the first connecting lug and the second connecting lug; the first connecting lug is connected to the first pole lug, and the second connecting lug is connected to the third pole lug.

[0005] In some embodiments, the first pole core body and the second pole core body are arranged along a first direction, the first connecting ear and the second connecting ear are staggered in the first direction, and the first pole tab and the third pole tab are staggered in the first direction.

[0006] In some embodiments, the first connecting lug and the second connecting lug are arranged opposite to each other in the first direction, and the first electrode lug and the third electrode lug are arranged opposite to each other in the first direction.

[0007] In some embodiments, a first spacer is further included, and the first spacer is disposed around the first electrode tab and the third electrode tab.

[0008] In some embodiments, the battery cell further includes a second tab and a fourth tab, wherein the second tab is connected to the first core body, and the fourth tab is connected to the second core body;

[0009] The battery cell further includes a second adapter plate, which includes a third connecting ear, a fourth connecting ear, and a second connecting portion arranged between the third connecting ear and the fourth connecting ear; the third connecting ear is connected to the second pole ear, and the fourth connecting ear is connected to the fourth pole ear.

[0010] In some embodiments, the first pole core body and the second pole core body are arranged along a first direction, the third connecting lug and the fourth connecting lug are staggered in the first direction, and the second pole lug and the fourth pole lug are staggered in the first direction.

[0011] In some embodiments, the first pole core body and the second pole core body are arranged along a first direction, the third connecting ear and the fourth connecting ear are arranged opposite each other in the first direction, and the second pole ear and the fourth pole ear are arranged opposite each other in the first direction.

[0012] In some embodiments, a second spacer is further included, and the second spacer is disposed around the third connecting ear and the fourth electrode ear.

[0013] In some embodiments, a first cover plate, a second cover plate and a shell are further included, wherein the first pole core body and the second pole core body are accommodated in the shell, and the first cover plate, the second cover plate and the shell cooperate to seal the first pole core body and the second pole core body; the first cover plate and the first connecting part are stacked and welded together, and the second cover plate and the second connecting part are stacked and welded together.

[0014] In some embodiments, the first cover plate has a first main pole, the first connecting portion is provided with a first secondary pole, and the first main pole and the first secondary pole are welded together on the outside of the first cover plate; the second cover plate has a second main pole, the second connecting portion is provided with a second secondary pole, and the second main pole and the second secondary pole are welded together on the outside of the second cover plate.

[0015] The first and third tabs are interconnected via a first adapter. This interconnection reduces the lengths of both the second and fourth tabs, thereby increasing the thickness of the core and improving the energy density of the cell while reducing the length of each tab. The second and fourth tabs are interconnected via a second adapter, resulting in a shorter length. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of a battery cell according to an embodiment of the present disclosure.

[0017] Figure 2 for Figure 1 Top view of the battery cell.

[0018] Figure 3 for Figure 1 Front view of the battery cell.

[0019] Figure 4 for Figure 1 Side view of the battery cell.

[0020] Figure 5 for Figure 1 Schematic diagram of the structure of the battery cell after the tab is bent.

[0021] Figure 6 for Figure 5 Schematic diagram of the structure when the battery cell is put into the shell.

[0022] Figure 7 It is a structural diagram of the first cover plate and the shell when assembled.

[0023] Figure 8 It is a structural diagram of the second cover plate and the housing when assembled.

[0024] Figure 9 Schematic diagram of the structure of the electrode core group in the battery cell of another embodiment of the present disclosure.

[0025] Figure 10 for Figure 9 Top view of the battery cell.

[0026] Figure 11 for Figure 9 Side view of the battery cell.

[0027] Figure 12 for Figure 9 Schematic diagram of the structure after the battery cell is inserted into the shell and connected to the second adapter.

[0028] Figure 13 for Figure 12 Top view of the structure shown.

[0029] Figure 14 for Figure 12 Front view of the structure shown.

[0030] Description of reference numerals:

[0031] 100, battery cell; 10, electrode core group; 110, first electrode core body; 111, first electrode tab; 112, second electrode tab; 120, second electrode core body; 121, third electrode tab; 122, fourth electrode tab; 20, first adapter; 210, first connecting portion; 220, first connecting tab; 230, second connecting tab; 240, first secondary pole; 30, second adapter; 310, second connecting portion; 320, third connecting tab; 330, fourth connecting tab; 340, second secondary pole; 40, housing; 50, first cover; 510, first main pole; 60, second cover; 610, second main pole; 70, first spacer; 80, second spacer. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present disclosure more clearly understood, specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below.

[0033] In the description of the present disclosure, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this disclosure, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this disclosure, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0036] In this disclosure, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions appear, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, the phrase "above," "above," and "above" a first feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The phrase "below," "below," and "below" a first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "right", "to the right" and similar expressions used in this disclosure are for illustrative purposes only and do not represent the only embodiment.

[0038] refer to Figures 1 to 5 , illustrates a battery cell 100 according to an embodiment of an aspect of the present disclosure. The battery cell 100 includes at least one electrode core group 10. Only one electrode core group 10 is schematically illustrated in the figure.

[0039] The electrode assembly 10 includes a first electrode body 110 and a second electrode body 120. The first electrode body 110 is connected to a first electrode tab 111 and a second electrode tab 112. The second electrode body 120 is connected to a third electrode tab 121 and a fourth electrode tab 122. Multiple first electrode tabs 111 and second electrode tabs 112 are provided, each connected to the positive electrode sheet and the negative electrode sheet in the first electrode body 110. Multiple third electrode tabs 121 and fourth electrode tabs 122 are provided, each connected to the positive electrode sheet and the negative electrode sheet in the second electrode body 120.

[0040] The first pole core body 110 and the second pole core body 120 are both single-cell batteries. The first pole core body 110 and the second pole core body 120 can be stacked cores or wound cores.

[0041] In one example, they are stacked cores, which can be obtained by cutting the positive electrode sheet, the negative electrode sheet, and the separator into specified sizes, and then stacking the positive electrode sheet, the separator, and the negative electrode sheet into a battery cell.

[0042] like Figure 1 As shown, in this embodiment, the first pole core body 110 and the second pole core body 120 are both stacked cores, stacked along the first direction Z. When the number of pole core groups 10 is greater than one, multiple pole core groups 10 are stacked in the first direction Z.

[0043] The battery cell 100 also includes a first adapter plate 20. The first adapter plate 20 interconnects the first electrode tab 111 and the third electrode tab 121. The first adapter plate 20 includes a first connecting portion 210, a first connecting tab 220, and a second connecting tab 230. The first connecting portion 210 is disposed between the first connecting tab 220 and the second connecting tab 230. The first connecting tab 220 is connected to the first electrode tab 111, and the second connecting tab 230 is connected to the third electrode tab 121.

[0044] After the first adapter plate 20 is connected to the first connecting lug 220 and the second connecting lug 230, the first connecting portion 210 extends in the first direction Z. The first connecting lug 220 and the second connecting lug 230 are spaced apart in the first direction Z. When the first electrode lug 111 and the third electrode lug 121 are not bent, the first connecting lug 220 and the second connecting lug 230 both extend in the second direction X. The first connecting portion 210 is used to connect to the first cover plate 50.

[0045] Furthermore, the battery cell 100 also includes a second adapter plate 30. The second adapter plate 30 interconnects the second electrode tab 112 and the fourth electrode tab 122. The second adapter plate 30 includes a second connecting portion 310, a third connecting tab 320, and a fourth connecting tab 330. The second connecting portion 310 is disposed between the third connecting tab 320 and the fourth connecting tab 330. The third connecting tab 320 is connected to the second electrode tab 112, and the fourth connecting tab 330 is connected to the fourth electrode tab 122.

[0046] After the second adapter plate 30 is connected to the third connecting lug 320 and the fourth connecting lug 330, the second connecting portion 310 extends along the first direction Z, and the third connecting lug 320 and the fourth connecting lug 330 are spaced apart in the first direction Z. When the second electrode lug 112 and the fourth electrode lug 122 are not bent, the third connecting lug 320 and the fourth connecting lug 330 both extend along the second direction X. The second connecting portion 310 is used to connect to the second cover plate 60.

[0047] It is easy to understand that in the present disclosure, the first adapter plate 20 and the second adapter plate 30 can be used simultaneously or alternatively.

[0048] refer to Figures 6 to 8 The battery cell 100 further includes a first cover plate 50, a second cover plate 60 and a housing 40. At this time, at least one electrode core group 10 is placed in the housing 40, and the first cover plate 50, the second cover plate 60 and the housing 40 together seal the electrode core group 10 in the housing 40.

[0049] In the battery cell 100 of the present disclosure, the first electrode tab 111 and the third electrode tab 121 are interconnected via the first adapter 20 and connected to the first cover plate 50 via the first connecting portion 210. When interconnected, the lengths of the second electrode tab 112 and the fourth electrode tab 122 are both reduced, thereby reducing the length of each electrode tab while increasing the thickness of the electrode core and improving the energy density of the battery cell 100. The second electrode tab 112 and the fourth electrode tab 122 are similar in that they are shorter.

[0050] refer to Figure 3 In the second direction X, the first electrode tab 111 and the second electrode tab 112 are disposed at opposite ends of the first electrode core body 110; the third electrode tab 121 and the fourth electrode tab 122 are disposed at opposite ends of the second electrode core body 120. In alternative embodiments, the first electrode tab 111 and the second electrode tab 112 are disposed at the same end of the first electrode core body 110, and the third electrode tab 121 and the fourth electrode tab 122 are disposed at the same end of the second electrode core body 120.

[0051] In some embodiments, reference Figure 1 and Figure 2 In the first direction Z, the first electrode tab 111 and the third electrode tab 121 are staggered, and the second electrode tab 112 and the fourth electrode tab 122 are staggered. The first connecting tab 220 and the second connecting tab 230 are disposed at opposite ends of the first connecting portion 210 in the first direction Z, and the first connecting tab 220 and the second connecting tab 230 are staggered in the first direction Z. The third connecting tab 320 and the fourth connecting tab 330 are disposed at opposite ends of the second connecting portion 310 in the first direction Z, and the third connecting tab 320 and the fourth connecting tab 330 are staggered in the first direction Z.

[0052] Take the connection between the first tab 111, the third tab 121 and the first adapter 20 as an example. When the first tab 111 and the third tab 121 are staggered in the first direction Z, as shown in FIG. Figure 2 As shown, when viewing the first and third pole tabs 111, 121 from above, the first and third pole tabs 111, 121 are located at different positions in the third direction Y. Furthermore, in the third direction Y, the first pole tab 111 is biased toward one side of the two pole cores, while the second pole tab 111 is biased toward the other side of the two pole cores. The first connecting tab 220 and the second connecting tab 230 are respectively extended from opposite ends of the first connecting portion 210 in the first direction Z to be welded to the first and third pole tabs 111, 121.

[0053] By staggering the first and third tabs 111, 121, there is a gap between them in the third direction Y. This gap facilitates welding the first and third tabs 111, 121 to the first and second connecting tabs 220, 230, respectively, and facilitates bending the first and third tabs 111, 121. The connection between the second and fourth tabs 112, 122 and the second adapter plate 30 is similar and will not be described in detail.

[0054] refer to Figures 6 to 8 The pole core assembly 10 is connected to a first cover plate 50 and a second cover plate 60. The first cover plate 50 is stacked with the first connecting portion 210. The first cover plate 50 has a first main pole 510. The first connecting portion 210 is provided with a first secondary pole 240. The first main pole 510 and the first secondary pole 240 are welded together on the outside of the first cover plate 50. The second cover plate 60 is stacked with the second connecting portion 310. The second cover plate 60 has a second main pole 610. The second connecting portion 310 is provided with a second secondary pole 340. The second main pole 610 and the second secondary pole 340 are welded together on the outside of the second cover plate 60.

[0055] The outer side of the cover plate refers to the side facing away from the housing 40 after the cover plate is closed. The welded connection between the first main pole 510 and the first secondary pole 240 on the outer side of the first cover plate 50 means that the welding interface between the first main pole 510 and the first secondary pole 240 is exposed on the outer side of the first cover plate 50, and the first main pole 510 and the first secondary pole 240 are welded together at the welding interface, forming a weld. The welded connection between the second main pole 610 and the second secondary pole 340 on the outer side of the second cover plate 60 means that the welding interface between the second main pole 610 and the second secondary pole 340 is exposed on the outer side of the second cover plate 60, and the welding interface is welded together at the second main pole 610 and the second secondary pole, forming a weld.

[0056] Optionally, the first secondary pole 240 is passed through the first main pole 510, and the end faces of the two are flush. Specifically, the first main pole 510 is provided with a center hole (not shown), and the first secondary pole 240 extends into the center hole. The first secondary pole 240 and the first main pole 510 are welded circumferentially. Optionally, the second secondary pole 340 is passed through the second main pole 610, and the end faces of the two are flush. Specifically, the second main pole 610 is provided with a center hole (not shown), and the second secondary pole 340 extends into the center hole. The second secondary pole 340 and the second main pole 610 are welded circumferentially. Optionally, the first secondary pole 240 and the first main pole 510 are arranged side by side, and the end faces of the two are flush. Optionally, the second secondary pole 340 and the second main pole 610 are arranged side by side, and the end faces of the two are flush.

[0057] In this embodiment, the provision of the first secondary pole 240 allows the welding interface between the first adapter plate 20 and the first main pole 510 of the first cover plate 50 to be exposed outside the first cover plate 50, thereby facilitating the use of laser welding to connect the first secondary pole 240 to the first main pole 510, thereby ensuring a high welding yield. The provision of the second secondary pole 340 allows the welding interface between the second adapter plate 30 and the second main pole 610 of the second cover plate 60 to be exposed outside the second cover plate 60, thereby facilitating the use of laser welding to connect the second secondary pole 340 to the second main pole 610, thereby ensuring a high welding yield.

[0058] The preparation process of the battery cell 100 of this embodiment is as follows:

[0059] 1. Reference Figures 1 to 4 , stack the first pole core body 110 above the second pole core body 120. Weld the first connecting ear 220 of the first positive adapter to the first pole ear 111, and weld the second connecting ear 230 to the third pole ear 121 to form a weld mark. Weld the third connecting ear 320 of the second adapter 30 to the second pole ear 112, and weld the fourth connecting ear 330 to the fourth pole ear 122. The welding process can be laser or ultrasonic welding. Among them, taking the welding of the first connecting ear 220 of the first positive adapter to the first pole ear 111 as an example, since the first pole ear 111 and the third pole ear 121 are staggered in the first direction Z, the working head of the ultrasonic welding equipment can be set on both sides of the first pole ear 111 in the first direction Z, so that ultrasonic welding can be used, which has good flexibility during preparation.

[0060] 2. Reference Figure 5 , bend the first electrode tab 111 , the third electrode tab 121 and the first adapter plate 20 , and bend the second electrode tab 112 , the fourth electrode tab 122 and the first adapter plate 20 .

[0061] 3. Reference Figure 6 As shown, the pole core assembly 10 is installed in a housing 40 .

[0062] 4. Figure 7 and Figure 8 As shown, the first cover plate 50 and the second cover plate 60 are respectively assembled with the housing 40 , wherein the first secondary pole 240 extends into the first main pole 510 and is laser welded, and the second secondary pole 340 extends into the second main pole 610 and is laser welded.

[0063] In some embodiments, a plurality of pole core assemblies 10 are provided, and the connection areas of each first adapter and the first cover plate 50 are staggered in the third direction Y, and the connection areas of each second adapter and the second cover plate 60 are staggered in the third direction Y. The third direction Y is perpendicular to the first direction Z and the second direction X. The third direction Y is specifically the width direction of the first pole core body 110 and the second pole core body 120.

[0064] The plurality of pole core assemblies 10 are connected to the first cover plate 50 via respective first adapters, and the connection areas of the plurality of first adapter pieces 20 and the first cover plate 50 are staggered so as not to interfere with each other. The plurality of pole core assemblies 10 are connected to the second cover plate 60 via respective second adapters, and the connection areas of the plurality of second adapter pieces and the first cover plate 50 are staggered so as not to interfere with each other.

[0065] For another embodiment of the battery cell 100, please refer to Figures 9 to 14 shown.

[0066] Different from the previous embodiment, in this embodiment, Figures 9 to 11 As shown, in the first direction Z, the first electrode tab 111 and the third electrode tab 121 are arranged opposite each other and centered in the third direction Y, and the second electrode tab 112 and the fourth electrode tab 122 are arranged opposite each other and centered in the third direction Y. In the first direction Z, the first connecting tab 220 and the second connecting tab 230 are arranged opposite each other and centered in the third direction Y, and the third connecting tab 320 and the fourth connecting tab 330 are arranged opposite each other and centered in the third direction Y.

[0067] In this embodiment, Figure 10 As shown, when viewed from above, the first electrode tab 111 blocks the third electrode tab 121, and the second electrode tab 112 blocks the fourth electrode tab 122 in the first direction Z. The first connecting tab 220 and the second connecting tab 230 extend from the same side of the first connecting portion 210, rather than from opposite ends of the first connecting portion 210. The third connecting tab 320 and the fourth connecting tab 330 extend from the same side of the second connecting portion 310, rather than from opposite ends of the second connecting portion 310.

[0068] like Figure 14 As shown, the battery cell 100 further includes a first spacer 70. The first spacer 70 is disposed around the first electrode tab 111 and the third electrode tab 121. The battery cell 100 further includes a second spacer 80. The second spacer 80 is disposed around the second electrode tab 112 and the fourth electrode tab 122. It is understood that the first spacer 70 and the second spacer 80 can be disposed alternatively.

[0069] The first spacer 70 is used to accommodate the bent first and third tabs 111, 121, preventing them from being inserted into the core after being bent. The second spacer 80 is used to accommodate the bent second and fourth tabs 112, 122, preventing them from being inserted into the core after being bent.

[0070] Optionally, the first spacer 70 is made of plastic and has a two-piece structure, so that it can be installed around the first and third tabs 111 and 121. Optionally, the second spacer 80 is made of plastic and has a two-piece structure, so that it can be installed around the second and fourth tabs 112 and 122.

[0071] In this embodiment, the first cover plate 50 and the first connection portion 210 are overlapped and connected by laser welding, and the second cover plate 60 and the second connection portion 310 are overlapped and connected by laser welding.

[0072] The preparation process of the battery cell 100 of this embodiment is as follows:

[0073] 1. Rely on Figures 9 to 11 As shown, the first pole core body 110 and the second pole core body 120 are stacked, and the first pole tab 111 and the third pole tab 121 are connected to the first adapter plate 20. In specific operations, the first pole tab 111 can be laser welded to the first connecting tab 220 of the first adapter plate 20. Then, the two stacked cores are flipped 180 degrees using the core clamping mechanism, and the third pole tab 121 is laser welded to the second connecting tab 230 of the first adapter plate 20. Using laser welding can increase the number of welding layers of the first pole tab 111 and the third pole tab 121. Then, the first cover plate 50 is laser welded or riveted to the first connecting portion 210.

[0074] 2. Reference Figures 12 to 14 , the electrode core assembly 10 is installed into the housing 40 . Then, the second electrode tab 112 and the fourth electrode tab 122 are laser welded to the second adapter plate 30 , and the second cover plate 60 is laser welded or riveted to the second connecting portion 310 .

[0075] 3. Figure 14 As shown, the first spacer 70 and the second spacer 80 are installed. Specifically, the first spacer 70 is sleeved around the first electrode tab 111 and the third electrode tab 121 , and the first spacer 70 is sleeved around the second electrode tab 112 and the fourth electrode tab 122 .

[0076] Fourth, bend the first tab 111, the third tab 121 and the first adapter 20, and laser weld the first cover 50 to the housing 40. Bend the second tab 112, the fourth tab 122 and the second adapter 30, and laser weld the second cover 60 to the housing 40.

[0077] Finally, it should be noted that the various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art could make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A battery cell, characterized in that: include: a first pole core body; a first pole tab connected to the first pole core body; a second pole core body; A third pole tab is connected to the second pole core body; The first adapter plate includes a first connecting ear, a second connecting ear, and a first connecting portion arranged between the first connecting ear and the second connecting ear; the first connecting ear is connected to the first electrode ear, and the second connecting ear is connected to the third electrode ear.

2. The battery cell according to claim 1, characterized in that The first pole core body and the second pole core body are arranged along a first direction, the first connecting ear and the second connecting ear are staggered in the first direction, and the first pole tab and the third pole tab are staggered in the first direction.

3. The battery cell according to claim 1, characterized in that The first connecting lug and the second connecting lug are arranged opposite to each other in the first direction, and the first electrode lug and the third electrode lug are arranged opposite to each other in the first direction.

4. The battery cell according to claim 3, characterized in that The system further includes a first spacer, which is disposed around the first electrode tab and the third electrode tab.

5. The battery cell according to claim 1, characterized in that The battery core further includes a second tab and a fourth tab, wherein the second tab is connected to the first core body, and the fourth tab is connected to the second core body; The battery cell further includes a second adapter plate, which includes a third connecting ear, a fourth connecting ear, and a second connecting portion arranged between the third connecting ear and the fourth connecting ear; the third connecting ear is connected to the second pole ear, and the fourth connecting ear is connected to the fourth pole ear.

6. The battery cell according to claim 5, characterized in that The first pole core body and the second pole core body are arranged along a first direction, the third connecting lug and the fourth connecting lug are staggered in the first direction, and the second pole lug and the fourth pole lug are staggered in the first direction.

7. The battery cell according to claim 5, characterized in that The first pole core body and the second pole core body are arranged along a first direction, the third connecting ear and the fourth connecting ear are arranged opposite each other in the first direction, and the second pole ear and the fourth pole ear are arranged opposite each other in the first direction.

8. The battery cell according to claim 7, characterized in that: It also includes a second spacer, which is arranged around the third connecting ear and the fourth electrode ear.

9. The battery cell according to claim 5, characterized in that It also includes a first cover plate, a second cover plate and a shell, the first pole core body and the second pole core body are accommodated in the shell, the first cover plate, the second cover plate and the shell cooperate to seal the first pole core body and the second pole core body; the first cover plate and the first connecting part are stacked and welded, and the second cover plate and the second connecting part are stacked and welded.

10. The battery cell according to claim 9, characterized in that: The first cover plate has a first main pole, the first connecting portion is provided with a first secondary pole, and the first main pole and the first secondary pole are welded together on the outside of the first cover plate; the second cover plate has a second main pole, the second connecting portion is provided with a second secondary pole, and the second main pole and the second secondary pole are welded together on the outside of the second cover plate.

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