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 the composite foil tab and metal tab of alternative laminated arrangement;Composite foil tab includes substrate layer, first conductive layer located substrate layer one side and second conductive layer located substrate layer other side, and through channel is equipped on composite foil tab;Metal tab has the connecting portion corresponding through channel;The connecting portion of metal tab is adapted to stretch into the through channel of composite foil tab adjacent to it, to make the first conductive layer and second conductive layer of composite foil tab adjacent to it electrically connected. Thus, the tab connecting structure of utility model embodiment can make the first conductive layer and second conductive layer of composite foil tab electrically connected by above-mentioned two ways. 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 composite foil electrode tabs and metal electrode tabs that are alternately stacked;

[0008] The composite foil tab includes a substrate layer, a first conductive layer located on one side of the substrate layer, and a second conductive layer located on the other side of the substrate layer, and the composite foil tab is provided with a through channel;

[0009] The metal tab has a connecting part corresponding to the through channel;

[0010] The connecting portion of the metal tab is adapted to extend into the through channel of the adjacent composite foil tab, so as to electrically connect the first conductive layer and the second conductive layer of the adjacent composite foil tab.

[0011] On the one hand, metal tabs are provided on both sides of the composite foil tab. The connecting part of the metal tabs on both sides of the composite foil tab is suitable for extending into the through channel of the composite foil tab and being electrically connected to each other, so that the first conductive layer and the second conductive layer of the composite foil tab are electrically connected.

[0012] On the other hand, the composite foil electrode has a metal electrode on only one side. The connecting part of the metal electrode on one side of the composite foil electrode is adapted to extend into the through channel of the composite foil electrode and be electrically connected to each other. The connecting part of the metal electrode can be electrically connected to the first conductive layer and the second conductive layer in the through channel at the same time, thereby enabling the first conductive layer and the second conductive layer of the composite foil electrode to be electrically connected.

[0013] Therefore, the tab connection structure of this utility model embodiment can electrically connect the first conductive layer and the second conductive layer of the composite foil tab through the above two methods.

[0014] 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.

[0015] In some embodiments, the connecting portions of the metal tabs on both sides of the composite foil tab are adapted to extend into the through-channel of the composite foil tab and be electrically connected to each other, so that the first conductive layer and the second conductive layer of the composite foil tab are electrically connected.

[0016] In some embodiments, the two outermost tabs of the tab connection structure are the composite foil tabs, or

[0017] The two outermost tabs of the tab connection structure are the metal tabs.

[0018] In some embodiments, the two outermost tabs of the tab connection structure are the composite foil tab and the metal tab, respectively.

[0019] In some embodiments, the cross-section of the through channel is either square or circular in the direction perpendicular to the thickness of the composite foil tab.

[0020] In some embodiments, the ratio between the cross-sectional area of ​​the through channel in the direction perpendicular to the thickness of the composite foil tab and the cross-sectional area of ​​the composite foil tab in the direction perpendicular to the thickness of the composite foil tab is 1%-72%.

[0021] 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%;

[0022] 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%.

[0023] This utility model also provides a battery cell.

[0024] The battery cell of this utility model embodiment includes the electrode connection structure described in the above embodiment.

[0025] In some embodiments, the battery cell further includes an adapter tab, which is electrically connected to the outside of the tab connection structure.

[0026] This utility model also provides a battery.

[0027] The battery of this utility model embodiment includes the battery cell described in the above embodiment. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the electrode connection structure according to an embodiment of the present utility model;

[0030] Figure 2 This is one of the schematic diagrams illustrating the application of the tab connection structure in this utility model embodiment;

[0031] Figure 3 This is the second schematic diagram of the application of the tab connection structure in this utility model embodiment;

[0032] Figure 4 This is the third schematic diagram of the application of the tab connection structure in this utility model embodiment;

[0033] Figure 5 This is a schematic diagram of the battery cell structure according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the composite foil electrode tab in an embodiment of this utility model.

[0035] In the picture:

[0036] 100. Electrode connection structure; 200. Battery cell;

[0037] 1. Composite foil tab; 101. Substrate layer; 102. First conductive layer; 103. Second conductive layer; 104. Through-channel;

[0038] 2. Metal tabs; 201. Connecting part;

[0039] 3. Adapter tabs. Detailed Implementation

[0040] 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.

[0041] 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.

[0042] 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.

[0043] In order to solve the problem that the conductive layers on both sides of the composite foil tab 1 in the related technology cannot conduct electricity effectively, this utility model provides a tab connection structure 100.

[0044] The electrode connection structure 100 of this utility model embodiment includes composite foil electrode 1 and metal electrode 2 alternately stacked. That is, the composite foil electrode 1 and metal electrode 2 are alternately stacked in the thickness direction. Here, the thickness direction can be the thickness direction of the composite foil electrode 1 or the thickness direction of the metal electrode 2, because the thickness directions of the two are the same.

[0045] The composite foil tab 1 includes a substrate layer 101, a first conductive layer 102 located on one side of the substrate layer 101, and a second conductive layer 103 located on the other side of the substrate layer 101. That is, in the thickness direction of the substrate layer 101, the first conductive layer 102 is located on one side of the substrate layer 101, and the second conductive layer 103 is located on the other side of the substrate layer 101.

[0046] Meanwhile, the composite foil tab 1 is provided with a through channel 104, which penetrates the first conductive layer 102, the substrate layer 101 and the second conductive layer 103.

[0047] The metal tab 2 has a connecting part 201 with a corresponding through channel;

[0048] The connecting portion 201 of the metal tab 2 is adapted to extend into the through channel of the adjacent composite foil tab 1 so as to electrically connect the first conductive layer 102 and the second conductive layer 103 of the adjacent composite foil tab 1.

[0049] On the one hand, metal tabs 2 are provided on both sides of the composite foil tab 1. The connecting part 201 of the metal tabs 2 on both sides of the composite foil tab 1 is suitable to extend into the through channel 104 of the composite foil tab 1 and be electrically connected to each other, so that the first conductive layer 102 and the second conductive layer 103 of the composite foil tab 1 are electrically connected.

[0050] On the other hand, the composite foil tab 1 is provided with a metal tab 2 on only one side. The connecting part 201 of the metal tab 2 on one side of the composite foil tab 1 is adapted to extend into the through channel 104 of the composite foil tab 1. The connecting part 201 of the metal tab 2 can be electrically connected to the first conductive layer 102 and the second conductive layer 103 in the through channel 104 at the same time, thereby enabling the first conductive layer 102 and the second conductive layer 103 of the composite foil tab 1 to be electrically connected.

[0051] Therefore, the tab connection structure 100 of this utility model embodiment can electrically connect the first conductive layer 102 and the second conductive layer 103 of the composite foil tab 1 through the above two methods.

[0052] Therefore, the tab connection structure 100 of this utility model embodiment enables the conductive layers on both sides of the composite foil tab 1 to be electrically connected.

[0053] In some embodiments, the connecting portions 201 of the metal tabs 2 on both sides of the composite foil tab 1 are adapted to extend into the through channel 104 of the composite foil tab 1 and be electrically connected to each other, so that the first conductive layer 102 and the second conductive layer 103 of the composite foil tab 1 are electrically connected.

[0054] By providing metal tabs 2 on both sides of the composite foil tab 1, and making the connecting parts 201 of the metal tabs 2 on both sides extend into the through channel 104 of the composite foil tab 1, the connecting parts 201 of the metal tabs 2 on both sides are electrically connected, thereby making the first conductive layer 102 and the second conductive layer 103 of the composite foil tab 1 electrically connected.

[0055] In some embodiments, the two outermost electrodes of the electrode connection structure 100 are composite foil electrodes 1, or the two outermost electrodes of the electrode connection structure 100 are metal electrodes 2.

[0056] In other words, the two outermost electrodes of the electrode connection structure 100 can be either two composite foil electrodes 1 or two metal electrodes 2.

[0057] When there are two composite foil tabs 1, the outermost composite foil tab 1 is provided with a metal tab 2 on only one side. The connecting part 201 of the metal tab 2 on the outermost composite foil tab 1 is adapted to extend into the through channel 104 of the outermost composite foil tab 1 and be electrically connected to each other. The connecting part 201 of the metal tab 2 can be electrically connected to the first conductive layer 102 and the second conductive layer 103 in the through channel 104 at the same time, thereby enabling the first conductive layer 102 and the second conductive layer 103 of the outermost composite foil tab 1 to be electrically connected.

[0058] In some embodiments, the two outermost tabs of the tab connection structure 100 are a composite foil tab 1 and a metal tab 2, respectively. The outermost composite foil tab 1 has a metal tab 2 on only one side. The connecting portion 201 of the metal tab 2 on one side of the outermost composite foil tab 1 is adapted to extend into the through channel 104 of the outermost composite foil tab 1 and be electrically connected to each other. The connecting portion 201 of the metal tab 2 can be electrically connected to the first conductive layer 102 and the second conductive layer 103 in the through channel 104 at the same time, thereby enabling the first conductive layer 102 and the second conductive layer 103 of the outermost composite foil tab 1 to be electrically connected.

[0059] In some embodiments, the cross-section of the through channel 104 in the direction perpendicular to the thickness of the composite foil tab is either square or circular.

[0060] It is understood that the cross-section of the through channel 104 is perpendicular to the thickness direction of the composite foil tab 1, and the cross-section of the through channel 104 can be square or circular. That is to say, in practical applications, the cross-section of the through channel 104 can be set to square or circular according to actual needs.

[0061] In some embodiments, the ratio between the cross-sectional area of ​​the through channel 104 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%.

[0062] It is understandable that the size of the cross-sectional area of ​​the through channel 104 is related to the current-carrying area between the first conductive layer 102 and the second conductive layer 103 of the composite foil tab 1. The larger the current-carrying area between the first conductive layer 102 and the second conductive layer 103, the stronger the current-carrying capacity between the first conductive layer 102 and the second conductive layer 103.

[0063] The larger the cross-sectional area of ​​the through channel 104, the smaller the remaining cross-sectional area of ​​the composite foil tab 1;

[0064] The smaller the cross-sectional area of ​​the through channel 104, 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 104 and the cross-sectional area of ​​the composite foil tab 1 to 1%-72% can ensure that the current carrying capacity between the first conductive layer 102 and the second conductive layer 103 meets the requirements.

[0066] In some embodiments, the ratio between the dimension of the through channel 104 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 104 in the width direction of the composite foil tab 1 and the width of the composite foil tab 1 is 10%-90%.

[0067] As mentioned above, the size of the cross-sectional area of ​​the through channel 104 is related to the current-carrying area between the first conductive layer 102 and the second conductive layer 103 of the composite foil tab 1. At the same time, the dimensions of the through channel 104 in the length direction of the composite foil tab 1 and the dimensions of the through channel 104 in the width direction of the composite foil tab 1 directly affect the size of the cross-sectional area of ​​the through channel 104.

[0068] Therefore, setting the ratio between the dimension of the through channel 104 in the length direction of the composite foil tab 1 and the length of the tab to 10%-80% and setting the ratio between the dimension of the through channel 104 in the width direction of the composite foil tab 1 and the width of the tab to 10%-90% ensures that the current carrying capacity between the first conductive layer 102 and the second conductive layer 103 meets the requirements.

[0069] This utility model also provides a battery cell 200.

[0070] The battery cell 200 of this embodiment includes the tab connection structure 100 described in the above embodiment.

[0071] In some embodiments, the battery cell 200 further includes an adapter tab 3, which is electrically connected to the outside of the tab connection structure 100.

[0072] Optionally, the adapter tab 3 is connected to the outermost composite foil tab 1, that is, the adapter tab 3 is connected to the composite foil tab 1. At this time, the composite foil tab 1 is provided with a through channel 104. The part of the adapter tab 3 corresponding to the through channel 104 can be deformed and extended into the through channel 104 and electrically connected to the connecting part 201 in the through channel 104.

[0073] Optionally, the adapter tab 3 is connected to the outermost metal tab 2.

[0074] This utility model also provides a battery.

[0075] The battery of this utility model embodiment includes the cell 200 as described in the above embodiment.

[0076] 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 composite foil tabs (1) and metal tabs (2) arranged in alternating layers; The composite foil tab (1) includes a substrate layer (101), a first conductive layer (102) located on one side of the substrate layer (101) and a second conductive layer (103) located on the other side of the substrate layer (101), and a through channel (104) is provided on the composite foil tab (1). The metal tab (2) has a connecting part (201) corresponding to the through channel. The connecting portion (201) of the metal tab (2) is adapted to extend into the through channel of the adjacent composite foil tab (1) so that the first conductive layer (102) and the second conductive layer (103) of the adjacent composite foil tab (1) are electrically connected.

2. The electrode connection structure according to claim 1, characterized in that, The connecting portion (201) of the metal tabs (2) on both sides of the composite foil tab (1) is adapted to extend into the through channel (104) of the composite foil tab (1) and be electrically connected to each other, so that the first conductive layer (102) and the second conductive layer (103) of the composite foil tab (1) are electrically connected.

3. The electrode connection structure according to claim 1, characterized in that, The two outermost electrodes of the electrode connection structure are the composite foil electrodes (1), or The two outermost electrodes of the electrode connection structure are the metal electrodes (2).

4. The electrode connection structure according to claim 1, characterized in that, The two outermost electrodes of the electrode connection structure are the composite foil electrode (1) and the metal electrode (2).

5. The electrode connection structure according to claim 1, characterized in that, In the direction perpendicular to the thickness of the composite foil tab (1), the cross-section of the through channel (104) is either square or circular.

6. The electrode connection structure according to any one of claims 1-5, characterized in that, The ratio between the cross-sectional area of ​​the through channel (104) 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%.

7. The electrode connection structure according to any one of claims 1-5, characterized in that, The ratio between the dimension of the through channel (104) 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 (104) in the width direction of the composite foil tab (1) and the width of the composite foil tab (1) is 10%-90%.

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 (3), which is electrically connected to the outside of the tab connection structure.

10. A battery, characterized in that, Including the battery cell as described in any one of claims 8-9.

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