Battery cell

Abstract

The utility model relates to a battery cell, the length of each tab can be reduced under the condition that the energy density of the battery cell is improved, the battery cell comprises a first pole core body, a first tab and a first adapter plate, the first tab is connected with the first pole core body, and the first adapter plate is connected with the first tab; the first pole core body, the second pole core body, the third pole lug and the third adapter piece are arranged on the first pole core body, the first pole lug is connected with the first pole core body, and the first adapter piece is connected with the first pole lug; and the first supporting structure is used for supporting the first adapter piece and the third adapter piece so as to realize welding and fixing of the first adapter piece and the third adapter piece.

Description

Technical Field

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

[0002] In order to pursue batteries with higher capacities, it is necessary to form battery cells with larger capacities, and the thickness of a single high-capacity battery cell is also greater. Most of the current stacked battery cells are formed by welding the tabs of the stacked cores to the adapter plates at the ends and then bending them into the case (i.e., inserting them into the housing). As the thickness of the battery cell increases, the length of the stacked core tabs also increases. However, if the stacked core tabs are too long, they are prone to tab folding during the production process. Therefore, the upper limit of the manufacturable length of the stacked core tabs limits the thickness of the stacked battery cell. Summary of the Utility Model

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

[0004] According to one aspect of the present disclosure, a battery cell includes a first pole core body, a first tab, and a first adapter plate, where the first tab is connected to the first pole core body, and the first adapter plate is connected to the first tab; a second pole core body, a third tab, and a third adapter plate, where the first tab is connected to the first pole core body, and the first adapter plate is connected to the first tab; a first support structure for supporting the first adapter plate and the third adapter plate to achieve welded fixation of the first adapter plate and the third adapter plate.

[0005] In some embodiments, it further includes a first positioning member connected to the first support structure; the first adapter plate is located on a side of the first support structure facing away from the first pole core body, and the first adapter plate is in snap-fit connection with the first positioning member.

[0006] In some embodiments, it further includes a second positioning member connected to the first support structure; the third adapter plate is located on a side of the first support structure facing away from the second pole core body, and the third adapter plate is in snap-fit connection with the second positioning member.

[0007] In some embodiments, a first auxiliary pole column is provided on a side of the first adapter plate facing away from the two pole core bodies, and the first auxiliary pole column is used for welded fixation with a first main pole column of a first cover plate.

[0008] In some embodiments, the weld seam between the first adapter plate and the third adapter plate is biased towards one side of the combination of the first adapter plate and the third adapter plate.

[0009] In some embodiments, the first tab and the third tab are bent towards each other with the first support structure as a support.

[0010] In some embodiments, the battery cell further includes a second tab, a second adapter piece, a fourth tab, and a fourth adapter piece. The second tab is connected to the first electrode core body, the second adapter piece is connected to the second tab, the fourth tab is connected to the second electrode core body, and the fourth adapter piece is connected to the fourth tab. The battery cell further includes a second support structure disposed on the other side of the first electrode core body and the second electrode core body for supporting the second adapter piece and the fourth adapter piece to achieve welding and fixing of the second adapter piece and the fourth adapter piece.

[0011] In some embodiments, a third positioning member is further included, and the third positioning member is connected to the second support structure. The second adapter piece is located on the side of the second support structure facing away from the first electrode core body, and the second adapter piece is in snap-fit connection with the third positioning member.

[0012] In some embodiments, a fourth positioning member is further included, and the fourth positioning member is connected to the second support structure. The fourth adapter piece is located on the side of the second support structure facing away from the second electrode core body, and the fourth adapter piece is in snap-fit connection with the fourth positioning member.

[0013] In some embodiments, a second auxiliary pole column is provided on the side of the second adapter piece facing away from the two electrode core bodies, and the second auxiliary pole column is used for welding and fixing with the second main pole column of the second cover plate.

[0014] In some embodiments, the weld between the second adapter piece and the fourth adapter piece is biased towards one side of the combination of the second adapter piece and the fourth adapter piece.

[0015] In some embodiments, the second tab and the fourth tab are bent towards each other with the second support structure as a support.

[0016] In the present disclosure, by using the first adapter piece and the third adapter piece as intermediate connecting pieces, the lengths of the first tab and the third tab are both reduced. By providing the second adapter piece and the fourth adapter piece as intermediate connecting pieces, the lengths of the second tab and the fourth tab are both reduced, so that the lengths of the respective tabs can be reduced while increasing the thickness of the electrode core body and improving the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure.

[0018] Figure 2 It is a schematic structural diagram of the battery cell from another angle according to an embodiment of the present disclosure.

[0019] Figure 3Schematic diagram of the structure of the first electrode core body and the second electrode core body in the battery cell according to an embodiment of the present disclosure.

[0020] Figure 4 is Figure 2 Side view of the first electrode core body and the second electrode core body in the battery cell according to an embodiment of the present disclosure.

[0021] Figure 5 Schematic diagram of the structure of two electrode core bodies before being stacked in the battery cell according to an embodiment of the present disclosure.

[0022] Figure 6 Schematic diagram of the structure of two electrode core bodies when being stacked in the battery cell according to an embodiment of the present disclosure.

[0023] Explanation of reference numerals:

[0024] 100, battery cell; 101, weld seam; 10, electrode core group; 110, first electrode core body; 111, first tab; 112, second tab; 120, second electrode core body; 121, third tab; 122, fourth tab; 20, first adapter; 210, first adapter plate; 220, third adapter plate; 230, first auxiliary pole; 30, second adapter; 310, second adapter plate; 320, fourth adapter plate; 330, second auxiliary pole; 40, housing; 50, first cover plate; 510, first main pole; 60, second cover plate; 610, second main pole; 710, first support structure; 720, first positioning member; 730, second positioning member; 810, second support structure; 820, third positioning member; 830, fourth positioning member; 90, positioning hole. Detailed implementation manners

[0025] To make the above objects, features and advantages of the present disclosure more obvious and understandable, the following detailed description of the specific implementation manners of the present disclosure will be given with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present disclosure. However, the present disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present disclosure. Therefore, the present disclosure is not limited by the specific embodiments disclosed below.

[0026] In the description of the present disclosure, it should be understood that if there appear such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present disclosure 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 of the present disclosure.

[0027] In addition, if there appear such terms as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present disclosure, if there appears the term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0028] In the present disclosure, unless otherwise clearly specified and limited, if there appear such terms as "mounted", "connected", "joined", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0029] In the present disclosure, unless otherwise clearly specified and limited, if there appears a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0030] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "right", "right" and similar expressions used in this disclosure are only for illustrative purposes and do not represent the only implementation.

[0031] Reference Figures 1 to 4 , which schematically shows a battery cell 100 according to an embodiment of the first aspect of the present disclosure. The battery cell 100 includes at least one electrode core group 10. Figure 3 and Figure 4 only schematically shows one electrode core group 10.

[0032] The electrode core group 10 includes a first electrode core body 110 and a second electrode core body 120. The first electrode core body 110 is connected with a first tab 111 and a second tab 112. The second electrode core body 120 is connected with a third tab 121 and a fourth tab 122. A plurality of first tabs 111 and second tabs 112 are respectively provided and are connected to the positive electrode sheet and the negative electrode sheet in the first electrode core body 110. A plurality of third tabs 121 and fourth tabs 122 are respectively provided and are connected to the positive electrode sheet and the negative electrode sheet in the second electrode core body 120.

[0033] Both the first electrode core body 110 and the second electrode core body 120 are battery cell monomers. The first electrode core body 110 and the second electrode core body 120 can be stacked cores or wound cores. In one example, they are stacked cores, which can be battery cell monomers formed by cutting positive electrode sheets, negative electrode sheets, and separators into specified sizes and then stacking the positive electrode sheets, separators, and negative electrode sheets.

[0034] As Figure 3 shown, in this embodiment, both the first electrode core body 110 and the second electrode core body 120 are stacked cores and are stacked along the first direction Z. When the number of electrode core groups 10 is greater than one, a plurality of electrode core groups 10 are stacked in the first direction Z.

[0035] In the present disclosure, the first direction Z is the thickness direction of the first electrode core body 110 and the second electrode core body 120. The second direction X is specifically the length direction of the first electrode core body 110 and the second electrode core body 120. The third direction Y is the width direction of the first electrode core body 110 and the second electrode core body 120. Generally, taking the first electrode core body 110 as an example, its thickness direction is perpendicular to its large surfaces, that is, the two side surfaces with the largest area. The second direction X and the third direction Y are both parallel to the large surfaces of the first electrode core body 110.

[0036] The battery cell 100 further includes a first connecting piece 210 and a third connecting piece 220. The first connecting piece 210 is connected to the first tab 111, the third connecting piece 220 is connected to the third tab 121, and the third connecting piece 220 and the first connecting piece 210 are spliced into a first connecting member 20 in the first direction Z.

[0037] The battery cell 100 further includes a second connecting piece 310 and a fourth connecting piece 320. The second connecting piece 310 is connected to the second tab 112, the fourth connecting piece 320 is connected to the fourth tab 122, and the fourth connecting piece 320 and the second connecting piece 310 are spliced into a second connecting member 30 in the first direction Z.

[0038] Further, referring to Figure 1 and Figure 2 , 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 jointly seal the electrode core group 10 in the housing 40. One side of the first connecting member 20 facing away from the two electrode cores is connected to the first cover plate 50. One side of the second connecting member 30 facing away from the two electrode core bodies is connected to the second cover plate 60.

[0039] In the battery cell 100 of the present disclosure, by using the first connecting piece 210 and the third connecting piece 220 as intermediate connecting members, the lengths of both the first tab 111 and the third tab 121 are reduced; by providing the second connecting piece 310 and the fourth connecting piece 320 as intermediate connecting members, the lengths of both the second tab 112 and the fourth tab 122 are reduced, so that the lengths of the respective tabs can be reduced while increasing the thickness of the electrode core body and improving the energy density of the battery cell 100.

[0040] As Figure 3 and Figure 4 shown, the battery cell 100 further includes a first support structure 710. The first support structure 710 is used to support the first connecting piece 210 and the third connecting piece 220 to realize the welding and fixing of the first connecting piece 210 and the third connecting piece 220. The first support structure 710 and the first connecting piece 210 and the third connecting piece 220 are positioned by, for example, a snap-fit method. The first connecting piece 210 and the third connecting piece 220 are respectively positioned on the first support structure 710, so that the first support structure 710 keeps the first connecting piece 210 and the third connecting piece 220 in a relative position state convenient for welding.

[0041] In some embodiments, the battery cell 100 further includes a first positioning member 720, and the first positioning member 720 is connected to the first support structure 710; the first connecting piece 210 is located on a side of the first support structure 710 facing away from the first electrode core body 110, and the first connecting piece 210 is in snap-fit engagement with the first positioning member 720.

[0042] In one example, the first positioning member 720 is a positioning post connected to the first support structure 710. The first adapter plate is provided with a positioning hole 90 adapted to the positioning post, as shown in Figure 5 .

[0043] In some embodiments, the battery cell 100 further includes a second positioning member 730, and the second positioning member 730 is connected to the first support structure 710; the third adapter plate 220 is located on the side of the first support structure 710 facing away from the second electrode core body 120, and the third adapter plate 220 is in snap-fit connection with the second positioning member 730.

[0044] In one example, the second positioning member 730 is a positioning post connected to the first support structure 710. The third adapter plate 220 is provided with a positioning hole 90 adapted to the positioning post, as shown in Figure 5 .

[0045] The first adapter plate 210 is located on the side of the first support structure 710 facing away from the first electrode core body 110, and the third adapter plate 220 is located on the side of the first support structure 710 facing away from the second electrode core body 120. In this way, both the first adapter plate 210 and the third adapter plate 220 are relatively far away from the first electrode core body 110 and the second electrode core body 120, and the first adapter plate 210 and the third adapter plate 220 can prevent the first electrode core body 110 and the second electrode core body 120 from being scalded when being welded.

[0046] In addition, the first support structure 710 also has the function of heat insulation. When the first adapter plate 210 and the third adapter plate 220 are welded, the first support structure 710 can block the heat from being transferred to the first electrode core body 110 and the second electrode core body 120, and can prevent the first electrode core body 110 and the second electrode core body 120 from being scalded.

[0047] Optionally, the first support structure 710 is a plastic part or a ceramic part; the outer shape is a cube, a columnar structure, etc.

[0048] In some embodiments, a first auxiliary pole 230 is provided on the side of the first adapter plate 210 facing away from the two electrode core bodies; the first auxiliary pole 230 is used for welding and fixing with the first main pole 510 of the first cover plate 50. By providing the first auxiliary pole 230, the connection between the first adapter 20 and the first cover plate 50 is facilitated.

[0049] In one example, the first main pole column 510 and the first secondary pole column 230 are nested and welded together. The first main pole column 510 is provided with a central hole (not labeled). The first secondary pole column 230 extends into the central hole of the first main pole column 510, and the first secondary pole column 230 and the first main pole column 510 are laser welded. Optionally, the first secondary pole column 230 extends into the central hole of the first main pole column 510, and the end faces of the first secondary pole column 230 and the first main pole column 510 are flush, facilitating the welding connection between the two.

[0050] Furthermore, the weld seam 101 between the first connecting piece 210 and the third connecting piece 220 is biased towards one side of the combination of the first connecting piece 210 and the third connecting piece 220.

[0051] In one example, referring to Figure 4 , in the first direction Z, the length of the first connecting piece 210 is greater than the length of the third connecting piece 220. In this way, the weld seam 101 after welding the first connecting piece 210 and the third connecting piece 220 is biased towards one side of the combination of the first connecting piece 210 and the third connecting piece 22. When the length of this combination is fixed, by designing the lengths of the first connecting piece 210 and the third connecting piece 220 to be different, it is more convenient to set the first secondary pole column 230 on the first connecting piece 210.

[0052] In some embodiments, as Figure 3 shown, the first tab 111 and the third tab 121 are bent towards each other with the first support structure 710 as the support.

[0053] Specifically, the first support structure 710 can be used to guide the bending of the first tab 111 and the third tab 121 and support the first connecting piece 210 and the third connecting piece 220. Thus, it is convenient to realize the welding and fixing of the first connecting piece 210 and the third connecting piece 220. During the preparation process of the battery cell 100, the first connecting piece 210 and the third connecting piece 220 can be spliced by bending the first tab 111 and the third tab 121, and neither the first connecting piece 210 nor the third connecting piece 220 needs to be bent. Therefore, during the preparation process of the battery cell 100, it is not necessary to bend the first connecting piece 210 and the third connecting piece 220.

[0054] In this embodiment, the battery cell 100 further includes a second support structure 810. The second support structure 810 is arranged on the other side of the first electrode core body 110 and the second electrode core body 120, and is used to support the second connecting piece 310 and the fourth connecting piece 320 to realize the welding and fixing of the second connecting piece 310 and the fourth connecting piece 320. Specifically, in the second direction X, the first support structure 710 and the second support structure 810 are arranged on the opposite sides of the combination of the first electrode core body 110 and the second electrode core body 120.

[0055] The second support structure 810 is used to support the second adapter plate 310 and the fourth adapter plate 320 to achieve the welding and fixing of the second adapter plate 310 and the fourth adapter plate 320. The second support structure 810 is positioned with the second adapter plate 310 and the fourth adapter plate 320, for example, by a snap-fastening method. The second adapter plate 310 and the fourth adapter plate 320 are respectively positioned on the second support structure 810, so that the second support structure 810 keeps the second adapter plate 310 and the fourth adapter plate 320 in a relative position state convenient for welding.

[0056] In some embodiments, the battery cell 100 further includes a third positioning member 820, and the third positioning member 820 is connected to the second support structure 810; the second adapter plate 310 is located on the side of the second support structure 810 facing away from the first electrode core body 110, and the second adapter plate 310 is in contact and cooperation with the third positioning member 820.

[0057] In one example, the third positioning member 820 is a positioning post connected to the second support structure 810. The second adapter plate 310 is provided with a positioning hole 90 adapted to the positioning post.

[0058] In some embodiments, the battery cell 100 further includes a fourth positioning member 830, and the fourth positioning member 830 is connected to the second support structure 810; the fourth adapter plate 320 is located on the side of the second support structure 810 facing away from the second electrode core body 120, and the fourth adapter plate 320 is in snap-fit connection with the fourth positioning member 830.

[0059] In one example, the fourth positioning member 830 is a positioning post connected to the second support structure 810. The fourth adapter plate 320 is provided with a positioning hole 90 adapted to the positioning post.

[0060] The second adapter plate 310 is located on the side of the second support structure 810 facing away from the first electrode core body 110, and the fourth adapter plate 320 is located on the side of the second support structure 810 facing away from the second electrode core body 120. In this way, both the second adapter plate 310 and the fourth adapter plate 320 are relatively far away from the first electrode core body 110 and the second electrode core body 120, and the first electrode core body 110 and the second electrode core body 120 can be prevented from being scalded when the second adapter plate 310 and the fourth adapter plate 320 are welded.

[0061] In addition, the second support structure 810 also has the function of heat insulation. When the second adapter plate 310 and the fourth adapter plate 320 are welded, the second support structure 810 can block the heat from being transferred to the first electrode core body 110 and the second electrode core body 12, and can prevent the first electrode core body 110 and the second electrode core body 12 from being scalded.

[0062] Optionally, the second support structure 810 is a plastic part or a ceramic part; the outer shape is a cube, a columnar structure, etc.

[0063] In some embodiments, a second sub-pole column 330 is provided on the side of the second adapter piece 310 facing away from the two pole core bodies; the second sub-pole column 330 is used for welding and fixing with the second main pole column 610 of the second cover plate 60. By providing the second sub-pole column 330, the connection between the second adapter 30 and the second cover plate 60 is facilitated.

[0064] In one example, the second main pole column 610 and the second sub-pole column 330 are nested and welded. The second main pole column 610 is provided with a central hole (not labeled). The second sub-pole column 330 extends into the central hole of the second main pole column 610, and the second main pole column 610 and the second sub-pole column 330 are laser welded. Optionally, the second sub-pole column 330 extends into the central hole of the second main pole column 610, and the end faces of the second sub-pole column 330 and the second main pole column 610 are flush, so as to facilitate welding the two together.

[0065] Further, similar to the weld seam 101 between the first adapter piece 210 and the third adapter piece 220 being biased towards one side of the combination of the first adapter piece 210 and the third adapter piece 220, the weld seam 101 between the second adapter piece 310 and the fourth adapter piece 320 is biased towards one side of the combination of the second adapter piece and the fourth adapter piece.

[0066] With such a design, when the length of the combination is fixed, by differentiating the lengths of the second adapter piece 310 and the fourth adapter piece 320, it is more convenient to provide the second sub-pole column 330 on the second adapter piece 310.

[0067] In some embodiments, multiple pole core groups 10 are provided, and the connection areas of the respective first adapters 20 with the first cover plate 50 are staggered in the third direction Y, and the connection areas of the respective second adapters 30 with the second cover plate 60 are staggered in the third direction Y. The third direction Y is perpendicular to the first direction Z and perpendicular to the second direction X. The third direction Y is specifically the width direction of the first pole core body 110.

[0068] Multiple pole core groups 10 are connected to the first cover plate 50 through their respective first adapters 20, and the connection areas of the multiple first adapters 20 with the first cover plate 50 are staggered so as not to interfere with each other. Multiple pole core groups 10 are connected to the second cover plate 60 through their respective second adapters 30, and the connection areas of the multiple second adapters 30 with the first cover plate 50 are staggered so as not to interfere with each other.

[0069] The advantages of the present disclosure's battery cell 100 will be further described below in conjunction with a preparation process of the battery cell 100 of the present disclosure.

[0070] Refer to Figure 5 , Figure 5Shows the state before the first electrode core body 110 and the second electrode core body 120 in the electrode core group 10 are connected. In this embodiment, in the second direction X, the first tab 111 and the second tab 112 are arranged on opposite sides of the first electrode core body 110; the third tab 121 and the fourth tab 122 are arranged on opposite sides of the second electrode core body 120.

[0071] There is a welded connection between the first adapter piece 210 and the first tab 111. Before they are connected, the first tab 111 has not been bent, and the welding method can be ultrasonic welding, laser welding, butterfly welding, etc. The welded connection between the third adapter piece 220 and the third tab 121 is similar. The welded connection between the second adapter piece 310 and the second tab 112 is similar. The welded connection between the fourth adapter piece 320 and the fourth tab 122 is similar.

[0072] II. Reference Figure 3 and Figure 6 , stack the first electrode core body 110 above the second electrode core body 120. Make the first tab 111 and the third tab 121 bend towards each other towards the plane where the contact surfaces of the two electrode core bodies are located with the first support structure 710 as the support, so that the first adapter piece 210 and the third adapter piece 220 are flipped to both extend along the first direction Z, and make the first adapter piece 210 and the third adapter piece 220 both positioned on the first support structure 710. In this way, in the first direction Z, the ends of the first adapter piece 210 and the third adapter piece 220 are close to each other and in a state where they can be welded. Make the second tab 112 and the fourth tab 122 bend towards each other with the second support structure 810 as the support, and make the second adapter piece 310 and the fourth adapter piece 320 both positioned on the second support structure 810. In this way, make the ends of the second adapter piece 310 and the fourth adapter piece 320 close to each other and in a state where they can be welded.

[0073] It should be noted that in the embodiments of the present disclosure, the case where the first electrode core body 110 is located above the second electrode core body 120 is taken as an example for description. However, the first electrode core body 110 can also be located below the second electrode core body 120.

[0074] II. Weld the first adapter piece 210 and the third adapter piece 220 to form a weld seam 101, and weld the second adapter piece 310 and the fourth adapter piece 320 to form a weld seam 101. By using the welding method, the first adapter piece 210 and the third adapter piece 220 are assembled into the first adapter 20, and the second adapter piece 310 and the fourth adapter piece 320 are assembled into the second adapter 30, so that the connection is reliable. In this way, the structure shown in Figure 3 and Figure 4 is obtained. The welding can specifically be ultrasonic welding, laser welding, butterfly welding, etc.

[0075] Taking the welding of the first connecting piece 210 and the third connecting piece 220 as an example, the end of the first connecting piece 210 and the end of the third connecting piece 220 can be in contact with each other or can be spaced apart by a certain distance. In this way, the bending positions of the first tab 111 and the third tab 121 can be selected as needed. When welding the second connecting piece 310 and the fourth connecting piece 320, the situation is similar.

[0076] III. Install the electrode core group 10 into the housing 40. Then, respectively assemble the first cover plate 50 and the second cover plate 60 to both ends of the housing 40. Among them, the first sub-pole column 230 extends into the first main pole column 510 and is laser welded, and the second sub-pole column extends into the second main pole column 610 and is laser welded. In this way, the structure shown in Figure 1 and Figure 2 is obtained.

[0077] The structural design of the disclosed battery cell 100 enables only the tabs to be bent during the preparation process of the battery cell 100, without the need to bend the first connecting piece 210, the third connecting piece 220, the second connecting piece 310, and the fourth connecting piece 320, and the bending difficulty is relatively low.

[0078] Finally, it should be noted that the technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0079] The above-described embodiments only represent several implementation manners of the present disclosure. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure should be subject to the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A first electrode core body, a first tab and a first adapter piece, wherein the first tab is connected to the first electrode core body, and the first adapter piece is connected to the first tab; A second electrode core body, a third tab and a third adapter piece, wherein the first tab is connected to the first electrode core body, and the first adapter piece is connected to the first tab; A first support structure for supporting the first adapter piece and the third adapter piece to achieve welding and fixing of the first adapter piece and the third adapter piece.

2. The cell according to claim 1, wherein Further comprising a first positioning member connected to the first support structure; the first adapter piece is located on a side of the first support structure facing away from the first electrode core body, and the first adapter piece is in snap-fit connection with the first positioning member.

3. The cell according to claim 1, wherein Further comprising a second positioning member connected to the first support structure; the third adapter piece is located on a side of the first support structure facing away from the second electrode core body, and the third adapter piece is in snap-fit connection with the second positioning member.

4. The battery cell according to claim 1, characterized in that, A first auxiliary pole is provided on a side of the first adapter piece facing away from the two electrode core bodies, and the first auxiliary pole is used for welding and fixing with a first main pole of a first cover plate.

5. The battery cell according to claim 4, wherein, The weld between the first adapter piece and the third adapter piece is biased towards one side of the combination of the first adapter piece and the third adapter piece.

6. The battery cell according to claim 1, characterized in that, The first tab and the third tab are bent towards each other with the first support structure as a support.

7. The cell according to claim 1, wherein The battery cell further comprises a second tab, a second adapter piece, a fourth tab and a fourth adapter piece, wherein the second tab is connected to the first electrode core body, the second adapter piece is connected to the second tab, the fourth tab is connected to the second electrode core body, and the fourth adapter piece is connected to the fourth tab; the battery cell further comprises a second support structure provided on the other side of the first electrode core body and the second electrode core body for supporting the second adapter piece and the fourth adapter piece to achieve welding and fixing of the second adapter piece and the fourth adapter piece.

8. The battery cell according to claim 7, wherein Further comprising a third positioning member connected to the second support structure; the second adapter piece is located on a side of the second support structure facing away from the first electrode core body, and the second adapter piece is in snap-fit connection with the third positioning member.

9. The battery cell according to claim 7, wherein further comprising a fourth positioning member connected to the second support structure; the fourth adapter piece is located on a side of the second support structure facing away from the second electrode core body, and the fourth adapter piece is in snap-fit connection with the fourth positioning member.

10. The battery cell according to claim 7, wherein A second auxiliary pole is provided on a side of the second adapter piece facing away from the two electrode core bodies, and the second auxiliary pole is used for welding and fixing with a second main pole of a second cover plate.

11. The battery cell according to claim 10, wherein The weld between the second adapter piece and the fourth adapter piece is biased towards one side of the combination of the second adapter piece and the fourth adapter piece.

12. The battery cell according to claim 7, wherein, The second tab and the fourth tab are bent towards each other with the second support structure as a support.

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