Tab connecting structure, battery cell and battery

Abstract

The utility model provides a kind of tab connecting structure, electric core and battery.The tab connecting structure of utility model embodiment includes multiple composite foil tabs of laminated arrangement, and the composite foil tab includes substrate layer and the conductive layer located at the both sides of substrate layer;Through channel is equipped on the composite foil tab, and the through channel of adjacent composite foil tab is misaligned arrangement;The composite foil tab has corresponding connecting portion with the through channel of adjacent composite foil tab, and the connecting portion of the composite foil tab is suitable for stretching into the through channel of the composite foil tab adjacent to it, to make the conductive layer of the composite foil tab electrically connected.Therefore, the tab connecting structure of utility model embodiment can make the conductive layer electrically connected on both sides of composite foil tab.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a tab connection structure, a battery cell, and a battery. Background Technology

[0002] In the new energy consumer market, lithium-ion batteries have rapidly occupied the 3C digital consumer market, the new energy vehicle market, and the energy storage application market due to their high energy density. With the development of the industry, the requirements for the electrical energy stored per unit mass of lithium-ion batteries are also getting higher and higher, that is, the requirements for the energy density of batteries are getting higher and higher.

[0003] To improve the energy density of lithium-ion batteries, composite foil current collectors are often used instead of traditional metal foil current collectors. Composite foil current collectors have two main advantages: firstly, they have a lower areal density, reducing the weight of the current collector and thus increasing the battery's energy density; secondly, due to the high ductility of polymer materials, when a lithium-ion battery is impacted by a foreign object, the polymer material can wrap around the fracture surface, preventing the fracture from puncturing the separator and causing a short circuit, reducing the risk of thermal runaway, and improving the safety performance of the lithium-ion battery.

[0004] However, due to the low conductivity of polymer materials, effective electrical conduction cannot occur between the conductive layers on both sides of the polymer material.

[0005] Therefore, the composite foil tabs in related technologies suffer from the problem that effective electrical conduction cannot occur between the conductive layers on both sides. Utility Model Content

[0006] This utility model provides a tab connection structure to solve the problem in related technologies where composite foil tabs cannot effectively conduct electricity between the conductive layers on both sides.

[0007] The electrode connection structure of this utility model embodiment includes multiple composite foil electrodes stacked together, wherein the composite foil electrodes include a substrate layer and conductive layers located on both sides of the substrate layer;

[0008] The composite foil tab is provided with a through channel, and the through channels of adjacent composite foil tabs are staggered.

[0009] The composite foil tab has a connecting portion corresponding to the through channel of an adjacent composite foil tab, and the connecting portion of the composite foil tab is adapted to extend into the through channel of the adjacent composite foil tab so as to electrically connect the conductive layer of the composite foil tab.

[0010] The following example illustrates three adjacent composite foil tabs: the first composite foil tab in the middle, the second composite foil tab on one side of the first composite foil tab, and the third composite foil tab on the other side of the first composite foil tab.

[0011] The conductive layer of the No. 2 composite foil electrode tab is electrically connected to the conductive layer on one side of the No. 1 composite foil electrode tab.

[0012] The conductive layer of the No. 3 composite foil tab is electrically connected to the conductive layer on the other side of the No. 1 composite foil tab.

[0013] The connecting part of the No. 2 composite foil electrode extends into the through channel of the No. 1 composite foil electrode, and the connecting part of the No. 3 composite foil electrode extends into the through channel of the No. 1 composite foil electrode. The conductive layer of the No. 2 composite foil electrode is connected to the conductive layer of the No. 3 composite foil electrode.

[0014] The conductive layer of the second composite foil tab is the conductive layer of the adjacent first composite foil tab, and the conductive layer of the third composite foil tab is the conductive layer of the adjacent first composite foil tab. Thus, the conductive layers of the second composite foil tab and the third composite foil tab are connected, enabling the conductive layers on both sides of the first composite foil tab to be electrically connected.

[0015] Therefore, the tab connection structure of this utility model embodiment enables the conductive layers on both sides of the composite foil tab to be electrically connected.

[0016] In some embodiments, the ratio between the cross-sectional area of ​​the through channel (101) in the direction perpendicular to the thickness of the composite foil tab (1) and the cross-sectional area of ​​the composite foil tab (1) in the direction perpendicular to the thickness of the composite foil tab (1) is 1%-72%.

[0017] In some embodiments, the ratio between the dimension of the through channel in the length direction of the composite foil tab and the length of the composite foil tab is 10%-80%;

[0018] The ratio between the dimension of the through channel in the width direction of the composite foil tab and the width of the composite foil tab is 10%-90%.

[0019] In some embodiments, the plurality of composite foil tabs include alternatingly stacked first composite foil tabs and second composite foil tabs;

[0020] The through-channel of the first composite foil electrode is a first through-channel, and the through-channel of the second composite foil electrode is a second through-channel;

[0021] The connecting portion of the first composite foil electrode tab is a first connecting portion, and the connecting portion of the second composite foil electrode tab is a second connecting portion;

[0022] The second connecting portions located on both sides of the first through channel are adapted to extend into the first through channel so that the conductive layer of the first composite foil tab is electrically connected.

[0023] The first connecting portions located on both sides of the second through channel are adapted to extend into the second through channel so as to electrically connect the conductive layers of the second composite foil tabs.

[0024] In some embodiments, the outermost composite foil tab is the first composite foil tab; the second connecting portion of the second composite foil tab adjacent to the outermost first composite foil tab is adapted to extend into the first through channel of the outermost first composite foil tab, so that the conductive layer of the outermost first composite foil tab is electrically connected.

[0025] In some embodiments, the outermost composite foil tab is the second composite foil tab; the first connecting portion of the first composite foil tab adjacent to the outermost second composite foil tab is adapted to extend into the second through channel of the outermost second composite foil tab, so that the conductive layer of the outermost second composite foil tab is electrically connected.

[0026] In some embodiments, the outermost composite foil tabs are the first composite foil tab and the second composite foil tab;

[0027] The second connecting portion of the second composite foil tab adjacent to the outermost first composite foil tab is adapted to extend into the first through channel of the outermost first composite foil tab, so as to electrically connect the conductive layer of the outermost first composite foil tab.

[0028] The first connecting portion of the first composite foil tab adjacent to the outermost second composite foil tab is adapted to extend into the second through channel of the outermost second composite foil tab, so as to electrically connect the conductive layer of the outermost second composite foil tab.

[0029] This utility model also provides a battery cell.

[0030] The battery cell of this utility model embodiment includes the tab connection structure as described in the above embodiment.

[0031] In some embodiments, the battery cell further includes an adapter tab, which is electrically connected to the outside of the tab connection structure.

[0032] This utility model also provides a battery.

[0033] The battery of this utility model embodiment includes the battery cell as described in the above embodiment. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the electrode connection structure according to an embodiment of the present utility model;

[0036] Figure 2 This is one of the schematic diagrams illustrating the application of the tab connection structure in this utility model embodiment;

[0037] Figure 3 This is the second schematic diagram of the application of the tab connection structure in this utility model embodiment;

[0038] Figure 4 This is the third schematic diagram of the application of the tab connection structure in this utility model embodiment;

[0039] Figure 5 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention;

[0040] Figure 6 This is a composite foil electrode tab according to an embodiment of the present invention.

[0041] In the picture:

[0042] 100. Electrode connection structure; 200. Battery cell;

[0043] 1. Composite foil tab; 101. Through channel; 102. Substrate layer; 103. Conductive layer; 104. Connector;

[0044] 2. First composite foil tab; 201. First through channel; 202. First connecting part;

[0045] 3. Second composite foil tab; 301. Second through channel; 302. Second connecting part;

[0046] 4. Adapter tabs. Detailed Implementation

[0047] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0048] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal encapsulation of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] To address the problem in related technologies where effective conductivity cannot be achieved between the two conductive layers 103 of the composite foil tab 1,

[0051] This utility model provides a tab connection structure 100.

[0052] The tab connection structure 100 of this utility model embodiment includes a plurality of composite foil tabs 1 stacked together. The composite foil tab 1 includes a substrate layer 102 and conductive layers 103 located on both sides of the substrate layer 102. That is, there are two conductive layers 103, which are respectively disposed on both sides of the thickness of the substrate layer 102.

[0053] Meanwhile, the composite foil tab 1 is provided with a through channel 101, and the through channels 101 of adjacent composite foil tabs 1 are staggered. That is to say, the projections of the through channels 101 of adjacent composite foil tabs 1 along the thickness direction of the composite foil tab 1 do not coincide. This arrangement is limited to the relationship between adjacent composite foil tabs 1.

[0054] The composite foil tab 1 has a connecting portion 104 corresponding to the through channel 101 of the adjacent composite foil tab 1. For example, in two adjacent composite foil tabs 1, one composite foil tab 1 is provided with a connecting portion 104 corresponding to the through channel 101 of the other composite foil tab 1, and the other composite foil tab 1 is also provided with a connecting portion 104 corresponding to the through channel 101 of one of the composite foil tabs 1.

[0055] At the same time, the connecting part 104 is adapted to extend into the through channel 101 of the adjacent composite foil tab 1 so that the conductive layer 103 of the composite foil tab 1 is electrically connected.

[0056] The following example illustrates three adjacent composite foil tabs 1, which include the first composite foil tab 1 located in the middle, the second composite foil tab 1 located on one side of the first composite foil tab 1, and the third composite foil tab 1 located on the other side of the first composite foil tab 1.

[0057] The conductive layer 103 of the second composite foil tab 1 is electrically connected to the conductive layer 103 on one side of the first composite foil tab 1.

[0058] The conductive layer 103 of the No. 3 composite foil tab 1 is electrically connected to the conductive layer 103 on the other side of the No. 1 composite foil tab 1.

[0059] The connecting part 104 of the second composite foil tab 1 extends into the through channel 101 of the first composite foil tab 1, and the connecting part 104 of the third composite foil tab 1 extends into the through channel 101 of the first composite foil tab. The conductive layer 103 of the second composite foil tab 1 is connected to the conductive layer 103 of the third composite foil tab 1.

[0060] The conductive layer 103 of the second composite foil tab 1 is adjacent to the conductive layer 103 of the first composite foil tab 1, and the conductive layer 103 of the third composite foil tab 1 is adjacent to the conductive layer 103 of the first composite foil tab 1. Thus, the conductive layer 103 of the second composite foil tab 1 and the conductive layer 103 of the third composite foil tab 1 are connected, which enables the conductive layers 103 on both sides of the first composite foil tab 1 to be electrically connected.

[0061] Therefore, the tab connection structure 100 of this utility model embodiment enables the conductive layers 103 on both sides of the composite foil tab 1 to be electrically connected.

[0062] In some embodiments, the ratio between the cross-sectional area of ​​the through channel 101 in the direction perpendicular to the thickness of the composite foil tab 1 and the cross-sectional area of ​​the composite foil tab 1 in the direction perpendicular to the thickness of the composite foil tab 1 is 1%-72%.

[0063] It is understandable that the size of the cross-sectional area of ​​the through channel 101 is related to the current-carrying area between the conductive layers 103 on both sides of the composite foil tab 1. The larger the current-carrying area between the conductive layers 103 on both sides of the composite foil tab 1, the stronger the current-carrying capacity between the conductive layers 103 on both sides of the composite foil tab 1.

[0064] It is understandable that the larger the cross-sectional area of ​​the through channel 101, the smaller the remaining cross-sectional area of ​​the composite foil tab 1; and the smaller the cross-sectional area of ​​the through channel 101, the larger the remaining cross-sectional area of ​​the composite foil tab 1.

[0065] Therefore, setting the ratio between the cross-sectional area of ​​the through channel 101 and the cross-sectional area of ​​the composite foil tab to 1%-72% ensures that the current carrying capacity between the first conductive layer 103 and the second conductive layer 103 meets the requirements.

[0066] In some embodiments, the ratio between the dimension of the through channel 101 in the length direction of the composite foil tab 1 and the length of the composite foil tab 1 is 10%-80%;

[0067] The ratio between the dimension of the through channel 101 in the width direction of the composite foil tab 1 and the width of the composite foil tab 1 is 10%-90%.

[0068] As mentioned above, the size of the cross-sectional area of ​​the through channel 101 is related to the current-carrying area between the conductive layers 103 on both sides of the composite foil tab 1. At the same time, the dimensions of the through channel 101 in the length direction of the composite foil tab 1 and the dimensions of the through channel 101 in the width direction of the composite foil tab directly affect the size of the cross-sectional area of ​​the through channel 101.

[0069] Therefore, setting the ratio between the dimension of the through channel 101 in the length direction of the composite foil tab 1 and the length of the composite foil tab 1 to 10%-80% and setting the ratio between the dimension of the through channel 101 in the width direction of the composite foil tab 1 and the width of the composite foil tab 1 to 10%-90% ensures that the current carrying capacity between the conductive layers 103 on both sides of the composite foil tab 1 meets the requirements.

[0070] In some embodiments, the plurality of composite foil tabs 1 include alternatingly stacked first composite foil tabs 2 and second composite foil tabs 3;

[0071] The through-channel 101 of the first composite foil electrode 2 is the first through-channel 201, and the through-channel 101 of the second composite foil electrode 3 is the second through-channel 301; the connecting part 104 of the first composite foil electrode 2 is the first connecting part 202, and the connecting part 104 of the second composite foil electrode 3 is the second connecting part 302.

[0072] The second connecting portions 302 located on both sides of the first through channel 201 are adapted to extend into the first through channel 201 so as to electrically connect the conductive layer 103 of the first composite foil tab 2; the first connecting portions 202 located on both sides of the second through channel 301 are adapted to extend into the second through channel 301 so as to electrically connect the conductive layer 103 of the second composite foil tab 3.

[0073] Specifically, the second connecting portions 302 of the two second composite foil tabs 3 located on both sides of the first composite foil tab 2 extend into the first through channel 201 of the first composite foil tab 2, so that the conductive layers 103 of the two second composite foil tabs 3 are electrically connected, thereby making the conductive layers 103 on both sides of the first composite foil tab 2 electrically connected.

[0074] Similarly, the first connecting portions 202 of the two first composite foil tabs 2 located on both sides of the second composite foil tab 3 extend into the second through channel 301 of the second composite foil tab 3, so that the conductive layers 103 of the two first composite foil tabs 2 are electrically connected, thereby making the conductive layers 103 on both sides of the second composite foil tab 3 electrically connected.

[0075] Therefore, the tab connection structure 100 of this utility model embodiment enables the conductive layers 103 on both sides of the composite foil tab 1 to be electrically connected.

[0076] In some embodiments, the outermost composite foil tab 1 is the first composite foil tab 2; the second connecting portion 302 of the second composite foil tab 3 adjacent to the outermost first composite foil tab 2 is adapted to extend into the first through channel 201 of the outermost first composite foil tab 2 so as to electrically connect the conductive layer 103 of the outermost first composite foil tab 2.

[0077] It is understandable that when the outermost composite foil tab 1 is the first composite foil tab 2, the outermost first composite foil tab 2 has a second composite foil tab 3 on only one side.

[0078] Since the first through channel 201 penetrates the first composite foil tab 2, that is, the inner wall of the first through channel 201 includes the conductive layers 103 on both sides of the first composite foil tab 2, at this time, the second connecting part 302 of the second composite foil tab 3 extends into the first through channel 201 of the outermost first composite foil tab 2, and the conductive layer 103 of the second composite foil tab 3 adjacent to the outermost first composite foil tab 2 can be electrically connected to the conductive layers 103 on both sides of the first composite foil tab 2 at the same time, thereby making the conductive layers 103 on both sides of the outermost first composite foil tab 2 electrically connected.

[0079] In some embodiments, the outermost composite foil tab 1 is the second composite foil tab 3; the first connecting portion 202 of the first composite foil tab 2 adjacent to the outermost second composite foil tab 3 is adapted to extend into the second through channel 301 of the outermost second composite foil tab 3 so as to electrically connect the conductive layer 103 of the outermost second composite foil tab 3.

[0080] It is understandable that when the outermost composite foil tab 1 is the second composite foil tab 3, the outermost second composite foil tab 3 only has a first composite foil tab 2 on one side.

[0081] The second through channel 301 penetrates the second composite foil tab 3. That is, the inner wall of the second through channel 301 includes the conductive layers 103 on both sides of the second composite foil tab 3. At this time, the first connecting part 202 of the first composite foil tab 2 extends into the first through channel 201 of the outermost second composite foil tab 3. The conductive layer 103 of the first composite foil tab 2 adjacent to the outermost second composite foil tab 3 can be electrically connected to the conductive layers 103 on both sides of the second composite foil tab 3 at the same time, thereby making the conductive layers 103 on both sides of the outermost second composite foil tab 3 electrically connected.

[0082] In some embodiments, the cross-section of the through channel 101 is either square or circular.

[0083] It is understood that the cross-section of the through channel 101 is perpendicular to the thickness direction of the composite foil tab 1, and the cross-section of the through channel 101 can be square or circular. That is to say, in practical applications, the cross-section of the through channel 101 can be set to square or circular according to actual needs.

[0084] In some embodiments, the outermost composite foil tabs 1 are respectively the first composite foil tab 2 and the second composite foil tab 3;

[0085] The second connecting portion 302 of the second composite foil tab 3 adjacent to the outermost first composite foil tab 2 is adapted to extend into the first through channel 201 of the outermost first composite foil tab 2 so as to electrically connect the conductive layer 103 of the outermost first composite foil tab 2.

[0086] The first connecting portion 202 of the first composite foil tab 2 adjacent to the outermost second composite foil tab 3 is adapted to extend into the second through channel 301 of the outermost second composite foil tab 3 so as to electrically connect the conductive layer 103 of the outermost second composite foil tab 3.

[0087] It is understandable that when the outermost composite foil tabs 1 are the first composite foil tab 2 and the second composite foil tab 3 respectively, the outermost first composite foil tab 2 has the second composite foil tab 3 on only one side, and the outermost second composite foil tab 3 has the first composite foil tab 2 on only one side.

[0088] The first through channel 201 penetrates the first composite foil tab 2, meaning that the inner wall of the first through channel 201 includes the conductive layers 103 on both sides of the first composite foil tab 2. At this time, the second connecting part 302 of the second composite foil tab 3 extends into the first through channel 201 of the outermost first composite foil tab 2. The conductive layer 103 of the second composite foil tab 3 adjacent to the outermost first composite foil tab 2 can be electrically connected to the conductive layers 103 on both sides of the first composite foil tab 2, thereby making the conductive layers 103 on both sides of the outermost first composite foil tab 2 electrically connected.

[0089] The second through channel 301 penetrates the second composite foil tab 3. That is, the inner wall of the second through channel 301 includes the conductive layers 103 on both sides of the second composite foil tab 3. At this time, the first connecting part 202 of the first composite foil tab 2 extends into the first through channel 201 of the outermost second composite foil tab 3. The conductive layer 103 of the first composite foil tab 2 adjacent to the outermost second composite foil tab 3 can be electrically connected to the conductive layers 103 on both sides of the second composite foil tab 3 at the same time, thereby making the conductive layers 103 on both sides of the outermost second composite foil tab 3 electrically connected.

[0090] This utility model also provides a battery cell 200.

[0091] The battery cell 200 of this embodiment includes the tab connection structure 100 of the above embodiment.

[0092] By providing the tab connection structure 100 of the above embodiment, the battery cell 200 of this utility model can achieve effective electrical connection between the conductive layers 103 on both sides of the composite foil tab 1 of the battery cell 200 of this utility model, and can also greatly shorten the conductive path between each composite foil tab 1, and further shorten the conductive path inside the battery cell 200.

[0093] In some embodiments, the battery cell 200 of this utility model further includes an adapter tab 4, which is electrically connected to the outside of the tab connection structure 100.

[0094] By providing an adapter tab 4, the battery cell 200 of this utility model embodiment can be easily electrically connected to external devices.

[0095] This utility model also provides a battery.

[0096] The battery of this utility model embodiment includes the cell 200 described in the above embodiment.

[0097] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A tab connection structure, characterized in that, It includes multiple composite foil tabs (1) stacked together, wherein the composite foil tabs (1) include a substrate layer (102) and conductive layers (103) located on both sides of the substrate layer (102). The composite foil tab (1) is provided with a through channel (101), and the through channels (101) of adjacent composite foil tabs (1) are staggered; The composite foil tab (1) has a connecting portion (104) corresponding to the through channel (101) of the adjacent composite foil tab (1). The connecting portion (104) of the composite foil tab (1) is adapted to extend into the through channel (101) of the adjacent composite foil tab (1) so that the conductive layers (103) on both sides of the adjacent composite foil tab (1) are electrically connected.

2. The electrode connection structure according to claim 1, characterized in that, The ratio between the cross-sectional area of ​​the through channel (101) in the direction perpendicular to the thickness of the composite foil tab (1) and the cross-sectional area of ​​the composite foil tab (1) in the direction perpendicular to the thickness of the composite foil tab (1) is 1%-72%.

3. The electrode connection structure according to claim 2, characterized in that, The ratio between the dimension of the through channel (101) in the length direction of the composite foil tab (1) and the length of the composite foil tab (1) is 10%-80%; The ratio between the dimension of the through channel (101) in the width direction of the composite foil tab (1) and the width of the composite foil tab (1) is 10%-90%.

4. The electrode connection structure according to any one of claims 1-3, characterized in that, The plurality of composite foil tabs (1) include alternatingly stacked first composite foil tabs (2) and second composite foil tabs (3); The through channel (101) of the first composite foil tab (2) is the first through channel (201), and the through channel (101) of the second composite foil tab (3) is the second through channel (301). The connecting portion (104) of the first composite foil tab (2) is the first connecting portion (202), and the connecting portion (104) of the second composite foil tab (3) is the second connecting portion (302). The second connecting portions (302) located on both sides of the first through channel (201) are adapted to extend into the first through channel (201) so that the conductive layer (103) of the first composite foil tab (2) is electrically connected. The first connecting portion (202) located on both sides of the second through channel (301) is adapted to extend into the second through channel (301) so that the conductive layer (103) of the second composite foil tab (3) is electrically connected.

5. The electrode connection structure according to claim 4, characterized in that, The outermost composite foil tab (1) is the first composite foil tab (2); the second connecting portion (302) of the second composite foil tab (3) adjacent to the outermost first composite foil tab (2) is adapted to extend into the first through channel (201) of the outermost first composite foil tab (2) so that the conductive layer (103) of the outermost first composite foil tab (2) is electrically connected.

6. The electrode connection structure according to claim 4, characterized in that, The outermost composite foil tab (1) is the second composite foil tab (3); the first connecting portion (202) of the first composite foil tab (2) adjacent to the outermost second composite foil tab (3) is adapted to extend into the second through channel (301) of the outermost second composite foil tab (3) so that the conductive layer (103) of the outermost second composite foil tab (3) is electrically connected.

7. The electrode connection structure according to claim 4, characterized in that, The outermost composite foil tabs (1) are the first composite foil tab (2) and the second composite foil tab (3), respectively. The second connecting portion (302) of the second composite foil tab (3) adjacent to the outermost first composite foil tab (2) is adapted to extend into the first through channel (201) of the outermost first composite foil tab (2) so that the conductive layer (103) of the outermost first composite foil tab (2) is electrically connected. The first connecting portion (202) of the first composite foil tab (2) adjacent to the outermost second composite foil tab (3) is adapted to extend into the second through channel (301) of the outermost second composite foil tab (3) so that the conductive layer (103) of the outermost second composite foil tab (3) is electrically connected.

8. A battery cell, characterized in that, Includes the tab connection structure as described in any one of claims 1-7.

9. The battery cell according to claim 8, characterized in that, The battery cell also includes an adapter tab (4), which is electrically connected to the outside of the tab connection structure.

10. A battery, characterized in that, Includes the battery cell as described in claim 8 or 9.

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