A full tab lamination structure

Abstract

The application provides a full-tab lamination structure, comprising at least one battery cell unit, wherein the battery cell unit comprises a plurality of positive electrode sheets and a plurality of negative electrode sheets, and a diaphragm is arranged between the positive electrode sheets and the negative electrode sheets; one side of the positive electrode sheet is provided with a plurality of first positive electrode tabs, and one side of the negative electrode sheet is provided with a plurality of first negative electrode tabs; when the plurality of positive electrode sheets and the plurality of negative electrode sheets are stacked, the plurality of first positive electrode tabs and the plurality of first negative electrode tabs are located on the same side, and the first positive electrode tabs located at the same position on the plurality of positive electrode sheets form a first positive electrode tab group, and the first negative electrode tabs located at the same position on the plurality of negative electrode sheets form a first negative electrode tab group; the full-tab lamination structure further comprises a second positive electrode tab and a second negative electrode tab, the second positive electrode tab is connected with the first positive electrode tab group, and the second negative electrode tab is connected with the first negative electrode tab group. The current and heat distribution of the structure are uniform, the internal resistance of the battery cell is low, and the structure can be used for fast charging and fast discharging.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a full-tab lamination structure. BACKGROUND

[0002] At present, water power, wind power and photovoltaic power in new energy are easily affected by external natural environment, have the characteristics of uncertainty, intermittence and uncontrollability, and the maximum amplitude of capacity fluctuation can reach 80% of installed capacity, and present the characteristics of anti-peaking, and cause significant curtailment of electricity. Moreover, the problems of insufficient power supply capacity during peak period and continuous growth of curtailed electricity during low valley caused by new energy peak mislocation will become more and more prominent, which also makes the energy storage technology occupy a more prominent position in the future power supply system, and become an important means of power peak shaving and peak load shifting.

[0003] Compared with traditional frequency modulation, the energy storage system has fast response rate, fast adjustment rate and high adjustment precision, and has stronger comprehensive frequency modulation capacity. Therefore, after large-scale, high-proportion new energy and large-capacity direct current are connected, in the face of new system generation instantaneous fluctuation, the energy storage system can make the power grid have stronger flexible adjustment capacity and safety and stability level.

[0004] However, large-capacity (such as capacity greater than 300Ah) single battery or large-capacity energy storage battery has many parts, complex structure and large volume, and the production efficiency is low. Moreover, the existing large-capacity single battery has problems of uneven internal heat distribution and uneven pole piece current distribution during charging and discharging, which greatly affects the cycle life of the single battery. SUMMARY

[0005] The application provides a full-tab lamination structure, which aims to solve the problems of uneven internal heat distribution and uneven pole piece current distribution during charging and discharging of the existing large-capacity single battery, which affects the cycle life of the single battery. The application adopts a full-tab structure, which is simple in structure, uniform in current distribution of the pole piece, low in heat generation during charging and discharging, and low in internal resistance of the battery, and is particularly suitable for large-capacity single batteries, and can be used for current charging and discharging and fast charging and discharging.

[0006] To achieve the above object, the full tab structure provided by the embodiments of the present application is suitable for power batteries, and comprises at least one cell unit, the cell unit comprises a plurality of positive plates and a plurality of negative plates, and a diaphragm is arranged between the positive plates and the negative plates; one side of the positive plate is provided with a plurality of first positive tabs, and one side of the negative plate is provided with a plurality of first negative tabs; when the plurality of positive plates and the plurality of negative plates are stacked, the plurality of first positive tabs and the plurality of first negative tabs are located on the same side, and the first positive tabs at the same position on the plurality of positive plates form a first positive tab group, and the first negative tabs at the same position on the plurality of negative plates form a first negative tab group.

[0007] The full tab structure further comprises a second positive tab and a second negative tab, the second positive tab is connected with the first positive tab group, and the second negative tab is connected with the first negative tab group.

[0008] As a preferred embodiment, when the plurality of positive plates and the plurality of negative plates are stacked, the first positive tabs at the same position on the plurality of positive plates are connected with each other to form a first positive tab group, and the first negative tabs at the same position on the plurality of negative plates are connected with each other to form a first negative tab group.

[0009] As a preferred embodiment, an insulating layer is arranged between the second positive tab and the second negative tab.

[0010] As a preferred embodiment, the insulating layer comprises a first insulating layer arranged on the second positive tab or / and a second insulating layer arranged on the second negative tab.

[0011] As a preferred embodiment, the first insulating layer is arranged on the side of the second positive tab close to the second negative tab, and the second insulating layer is arranged on the side of the second negative tab close to the second positive tab.

[0012] As a preferred embodiment, a gap is arranged between the second positive tab and the second negative tab.

[0013] As a preferred embodiment, the second positive tab comprises a positive tab body, a positive column connecting part arranged at one end of the positive tab body, and a plurality of positive tab connecting parts arranged on the positive tab body, the positive tab connecting parts are connected with the first positive tab group, and the positive tab connecting parts are arranged in one-to-one correspondence with the first positive tab group.

[0014] As a preferred embodiment, each positive tab connecting part is protrudingly arranged on the side of the positive tab body, and the positive tab connecting part is adaptively arranged with the first positive tab group.

[0015] In a preferred embodiment, the positive electrode body, the positive electrode post connection portion, and the positive electrode connection portion are integrally formed, and the first insulating layer is disposed on the side of the positive electrode body near the second negative electrode.

[0016] In a preferred embodiment, the second negative electrode includes a negative electrode body, a negative electrode post connection portion disposed at one end of the negative electrode body, and a plurality of negative electrode connection portions disposed on the negative electrode body. The negative electrode connection portions are connected to the first negative electrode group, and the negative electrode connection portions are disposed in a one-to-one correspondence with the first negative electrode group.

[0017] In a preferred embodiment, each of the negative electrode tab connecting portions protrudes from the side of the negative electrode tab body, and the negative electrode tab connecting portion is adapted to the first negative electrode tab group.

[0018] In a preferred embodiment, the negative electrode body, the negative electrode post connection portion, and the negative electrode ear connection portion are integrally formed, and the second insulating layer is disposed on the side of the negative electrode body near the second positive electrode ear.

[0019] In a preferred embodiment, the positive terminal connection portion and the negative terminal connection portion are respectively disposed at both ends of the full-tab stacked structure; the positive terminal connection portion is connected to the positive terminal of the power battery; and the negative terminal connection portion is connected to the negative terminal of the power battery.

[0020] In a preferred embodiment, multiple first positive tabs are arranged independently of each other, and multiple first negative tabs are arranged independently of each other; when several positive electrode plates and several negative electrode plates are stacked, the first positive tabs and the first negative tabs are arranged alternately.

[0021] In a preferred embodiment, the height of the first positive electrode tab is different from the height of the first negative electrode tab.

[0022] In a preferred embodiment, when several positive electrode sheets and several negative electrode sheets are stacked, there are multiple first positive electrode tab groups and multiple first negative electrode tab groups; the first positive electrode tab groups and the first negative electrode tab groups are alternately arranged, and the first positive electrode tab groups and the first negative electrode tab groups are on the same plane.

[0023] In a preferred embodiment, the height of the first positive electrode ear group is different from the height of the first negative electrode ear group.

[0024] In a preferred embodiment, the height of the first positive electrode group is less than the height of the first negative electrode group, the second positive electrode is disposed above the second negative electrode, and the negative electrode connecting part, which is located in the position overlapping with the second positive electrode, is connected to the side of the negative electrode body through an arc.

[0025] Alternatively, the height of the first positive electrode group is greater than the height of the first negative electrode group, the second positive electrode is disposed below the second negative electrode, and the positive electrode connecting part, which is located in the position overlapping with the second negative electrode, is connected to the side of the positive electrode body through an arc.

[0026] In a preferred embodiment, the full-tab stacked structure is a square full-tab stacked structure; the power battery is a lithium-ion battery or a sodium-ion battery.

[0027] This application, by setting a first positive tab group and a second positive tab, and a first negative tab group and a second negative tab, so that the first positive tab group and the second positive tab are connected to form a full tab, and the first negative tab group and the second negative tab are connected to form a full tab, effectively improves the cell's overcurrent capability while improving the cell's heat conduction and dissipation, thereby effectively reducing the cell's heat generation and thus effectively increasing the cell's cycle life. By setting multiple first positive tabs on the positive electrode and multiple first negative tabs on the negative electrode, the current on the electrode and the heat inside the cell can be evenly distributed, effectively reducing the cell's internal resistance and heat generation during charging and discharging. This application has a simple structure, with direct connection between the tabs and the terminals, eliminating the need for connecting tabs, making it particularly suitable for large-capacity single-cell batteries, enabling current charging and discharging as well as fast charging and discharging. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a multi-tab stacked structure according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure of two battery cell units with a full-tab stacked structure;

[0031] Figure 3 for Figure 2 A schematic diagram of the structure of a single battery cell unit;

[0032] Figure 4 for Figure 1 A schematic diagram of the structure of a positive electrode with a multi-tab stacked structure;

[0033] Figure 5 for Figure 1A schematic diagram of the negative electrode with a multi-tab stacked structure. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, top, bottom, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] Currently, existing high-capacity single-cell batteries suffer from uneven internal heat distribution and uneven electrode current distribution during charging and discharging, affecting the cycle life of the single-cell battery. Furthermore, high-capacity single-cell batteries have numerous components, are large in size, and have complex structures, resulting in low production efficiency. Based on this, this application provides a full-tab stacked structure.

[0040] In the multi-tab stacked structure of this application embodiment, the number of battery cell units can be set according to actual usage needs. It can be set to one, two, three, four, or even more.

[0041] When there are multiple battery cells, they can share one second positive tab and one second negative tab. The number of positive tab connections is set according to the number of first positive tab groups of all battery cells (generally, the number of positive tab connections is greater than or equal to (preferably equal to) the number of first positive tab groups); the number of negative tab connections is set according to the number of first negative tab groups of all battery cells (generally, the number of negative tab connections is greater than or equal to (preferably equal to) the number of first negative tab groups).

[0042] Specifically, in this embodiment, the omni-tab stacked structure with two battery cell units is used as an example to describe the omni-tab stacked structure in detail.

[0043] like Figures 1 to 5 As shown, this embodiment provides a full-tab stacked structure suitable for power batteries, including two cell units 10 (the two cell units 10 are symmetrically arranged). Each cell unit 10 includes a plurality of positive electrode plates 11 and a plurality of negative electrode plates 12. A separator (not shown in the figure) is provided between the positive electrode plates 11 and the negative electrode plates 12. A plurality of first positive electrode tabs 111 are provided on one side of the positive electrode plate 11, and a plurality of first negative electrode tabs 121 are provided on one side of the negative electrode plate 12. When the plurality of positive electrode plates 11 and the plurality of negative electrode plates 12 are stacked, the plurality of first positive electrode tabs 111 and the plurality of first negative electrode tabs 121 are located on the same side, and the first positive electrode tabs 111 at the same position on the plurality of positive electrode plates 11 form a first positive electrode tab group A, and the first negative electrode tabs 121 at the same position on the plurality of negative electrode plates 12 form a first negative electrode tab group B.

[0044] The multi-tab stacked structure further includes a second positive tab 20 and a second negative tab 30, wherein the second positive tab 20 is connected to the first positive tab group A, and the second negative tab 30 is connected to the first negative tab group B.

[0045] In a preferred embodiment, when the plurality of positive electrode plates 11 and the plurality of negative electrode plates 12 are stacked, the first positive electrode tabs 111 at the same position on the plurality of positive electrode plates 11 are interconnected to form a first positive electrode tab group A, and the first negative electrode tabs 121 at the same position on the plurality of negative electrode plates 12 are interconnected to form a first negative electrode tab group B. That is, in the embodiments of this application, the first positive electrode tabs stacked in the first positive electrode tab group A are interconnected, and the first negative electrode tabs stacked in the first negative electrode tab group B are interconnected.

[0046] Taking the first positive tab at position X on several positive electrode plates (with the same size and stacking position) as an example, the first positive tab at the same position refers to the first positive tab set at position X on each positive electrode plate.

[0047] In this embodiment, two battery cell units are symmetrically arranged on both sides of the second positive electrode 20 (the second negative electrode 30), and the second positive electrode 20 and the second negative electrode 30 can adopt similar structures. The number of the first positive electrode 111 and the first negative electrode 121 can be set according to actual usage needs, and can be set to two, three, four or even more. Specifically, in this embodiment, the number of the first positive electrode 111 for each positive electrode and the number of the first negative electrode 121 for each negative electrode is three.

[0048] In a preferred embodiment, an insulating layer (not shown in the figure) is provided between the second positive electrode 20 and the second negative electrode 30. By providing an insulating layer, the risk of short circuit caused by contact between the second positive electrode and the second negative electrode can be effectively prevented.

[0049] In a preferred embodiment, the insulating layer includes a first insulating layer (not shown in the figure) disposed on the second positive electrode tab 20 and / or a second insulating layer (not shown in the figure) disposed on the second negative electrode tab 30. That is, depending on actual usage needs, only the first insulating layer can be disposed on the second positive electrode tab; or only the second insulating layer can be disposed on the second negative electrode tab; or, specifically as in this embodiment, both the first and second insulating layers can be disposed on the second positive electrode tab. Simultaneously disposing of the first and second insulating layers enables multiple insulation protection, resulting in better insulation performance.

[0050] In a preferred embodiment, the first insulating layer is disposed on the side of the second positive electrode 20 near the second negative electrode 30, and the second insulating layer is disposed on the side of the second negative electrode 30 near the second positive electrode 20. This arrangement provides better insulation. In another preferred embodiment, a gap is provided between the second positive electrode 20 and the second negative electrode 30. By providing a gap and working in conjunction with the insulating layer, the risk of short circuits caused by contact between the second positive electrode and the second negative electrode can be further prevented.

[0051] In a preferred embodiment, the second positive electrode tab 20 includes a positive electrode tab body 21, a positive electrode post connection portion 22 disposed at one end of the positive electrode tab body 21, and a plurality of positive electrode tab connection portions 23 disposed on the positive electrode tab body 21. The positive electrode tab connection portions 23 are connected to the first positive electrode tab group A, and the positive electrode tab connection portions 23 are arranged in a one-to-one correspondence with the first positive electrode tab group A (that is, the number and position of the positive electrode tab connection portions 23 correspond to the number and position of the first positive electrode tab group A).

[0052] In a preferred embodiment, each of the positive electrode tab connection portions 23 protrudes from the side of the positive electrode tab body 21, and the positive electrode tab connection portion 23 is adapted to the first positive electrode tab group A (i.e., the size and shape of the positive electrode tab connection portion 23 are adapted to the size and shape of the first positive electrode tab group A).

[0053] In a preferred embodiment, the positive electrode body 21, the positive electrode post connection portion 22, and the positive electrode connection portion 23 are integrally formed, and the first insulating layer is disposed on the side of the positive electrode body 21 near the second negative electrode 30.

[0054] Specifically, in this embodiment, the surface of the positive electrode tab body 21, except for the positions connected to the positive electrode post connection 22 and the positive electrode tab connection 23, is provided with an insulating layer. The insulating layer can be provided by injection molding, spraying, coating, or heat-shrink tubing, etc. The insulating layer material is chosen according to actual use and can be PP, or other insulating and electrolyte-resistant materials such as PPS.

[0055] In a preferred embodiment, the second negative electrode tab 30 includes a negative electrode tab body 31, a negative electrode post connecting portion 32 disposed at one end of the negative electrode tab body 31, and a plurality of negative electrode tab connecting portions 33 disposed on the negative electrode tab body 31. The negative electrode tab connecting portions 33 are connected to the first negative electrode tab group B, and the negative electrode tab connecting portions 33 are arranged in a one-to-one correspondence with the first negative electrode tab group B (that is, the number and position of the negative electrode tab connecting portions 33 correspond to the number and position of the first negative electrode tab group B).

[0056] In a preferred embodiment, each of the negative electrode tab connecting portions 33 protrudes from the side of the negative electrode tab body 31, and the negative electrode tab connecting portions 33 are adapted to the first negative electrode tab group B (i.e., the size and shape of the negative electrode tab connecting portions 33 are adapted to the size and shape of the first negative electrode tab group B).

[0057] In a preferred embodiment, the negative electrode body 31, the negative electrode post connection portion 32, and the negative electrode connection portion 33 are integrally formed, and the second insulating layer is disposed on the side of the negative electrode body 31 near the second positive electrode 20.

[0058] Specifically, in the embodiments of this application, the surface of the negative electrode tab body 31 is provided with an insulating layer at the positions connected to the negative electrode post connection portion 32 and the negative electrode tab connection portion 33, except for the positions connected to the negative electrode post connection portion 32.

[0059] In a preferred embodiment, the positive terminal connection 22 and the negative terminal connection 32 are respectively disposed at both ends of the multi-tab stacked structure; the positive terminal connection 22 is connected to the positive terminal (not shown in the figure) of the power battery; the negative terminal connection 32 is connected to the negative terminal (not shown in the figure) of the power battery. In this way, a multi-tab configuration of the battery cell can be achieved without changing the traditional cover plate structure; in use, a traditional cover plate structure can be used, connecting the positive terminal connection 22 to the positive terminal (not shown in the figure) of the traditional cover plate structure, and connecting the negative terminal connection 32 to the negative terminal of the traditional cover plate structure.

[0060] In a preferred embodiment, multiple first positive tabs 111 are arranged independently of each other, and multiple first negative tabs 121 are arranged independently of each other; when multiple positive electrode plates 11 and multiple negative electrode plates 12 are stacked, the first positive tabs 111 and the first negative tabs 121 are arranged alternately.

[0061] In a preferred embodiment, the height of the first positive electrode tab 111 is different from the height of the first negative electrode tab 121. This arrangement ensures that there is a gap between the second positive electrode tab 20 and the second negative electrode tab 30, thereby effectively guaranteeing insulation.

[0062] Specifically, in this embodiment, the height of the first positive electrode tab 111 is less than the height of the first negative electrode tab 121. It is understood that in other embodiments, the height of the first positive electrode tab 111 may be greater than or equal to the height of the first negative electrode tab 121.

[0063] In a preferred embodiment, when the plurality of positive electrode sheets 11 and the plurality of negative electrode sheets 12 are stacked, there are multiple first positive electrode tab groups A and multiple first negative electrode tab groups B; the first positive electrode tab groups A and the first negative electrode tab groups B are alternately arranged, and the first positive electrode tab groups A and the first negative electrode tab groups B are on the same plane. This simplifies the connection between components, effectively saves space, and facilitates stable connection between the cell unit, the second positive electrode tab, and the second negative electrode tab without changing the traditional cover plate structure. This allows the all-tab stacked structure of this application to be assembled into a battery structure using a traditional cover plate structure.

[0064] In a preferred embodiment, the height of the first positive electrode tab group A is different from the height of the first negative electrode tab group B. This arrangement effectively ensures that there is a gap between the second positive electrode tab 20 and the second negative electrode tab 30, thereby effectively ensuring insulation.

[0065] Specifically, in this embodiment, the height of the first positive electrode group A is less than the height of the first negative electrode group B. In this case, the second positive electrode 20 is positioned above the second negative electrode 30, and the negative electrode connecting portion 33, which overlaps with the second positive electrode 20, is connected to the side of the negative electrode body 31 via an arc portion 34. An insulating layer (third insulating layer) is also provided on the outer surface of the arc portion 34 to effectively ensure insulation.

[0066] It is understood that in other embodiments, the height of the first positive electrode group A may also be greater than or equal to the height of the first negative electrode group B.

[0067] For example, in other embodiments, when the height of the first positive electrode group A is greater than the height of the first negative electrode group B, the second positive electrode 20 is disposed below the second negative electrode 30, and the positive electrode connecting portion 23, which is located in the position overlapping with the second negative electrode 30, is connected to the side of the positive electrode body 21 through an arc portion.

[0068] The height difference between the first positive tab group A and the first negative tab group B can affect the curvature (i.e., tilt angle) of the arc portion, meaning the curvature of the arc portion is adapted to the height difference between the first positive tab group A and the first negative tab group B. This effectively ensures insulation while simplifying the connection between components. It facilitates stable connection between the cell unit, the second positive tab, and the second negative tab without altering the traditional cover plate structure, allowing the all-tab stacked structure of this application to be assembled into a battery structure using a traditional cover plate structure.

[0069] In a preferred embodiment, the full-tab stacked structure is a square full-tab stacked structure; the power battery is a lithium-ion battery or a sodium-ion battery. Specifically, in this embodiment, the power battery is a lithium-ion battery.

[0070] This application, by setting a first positive tab group and a second positive tab, and a first negative tab group and a second negative tab, so that the first positive tab group and the second positive tab are connected to form a full tab, and the first negative tab group and the second negative tab are connected to form a full tab, effectively improves the cell's overcurrent capability while improving the cell's heat conduction and dissipation, thereby effectively reducing the cell's heat generation and thus effectively increasing the cell's cycle life. By setting multiple first positive tabs on the positive electrode and multiple first negative tabs on the negative electrode, the current on the electrode and the heat inside the cell can be evenly distributed, effectively reducing the cell's internal resistance and heat generation during charging and discharging. This application has a simple structure, with direct connection between the tabs and the terminals, eliminating the need for connecting tabs, making it particularly suitable for large-capacity single-cell batteries, enabling current charging and discharging as well as fast charging and discharging.

[0071] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0072] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-pole tab stacked structure, characterized in that, Applicable to power batteries, including at least one cell unit, the cell unit including a plurality of positive electrode plates and a plurality of negative electrode plates, wherein a separator is disposed between the positive electrode plates and the negative electrode plates; a plurality of first positive electrode tabs are disposed on one side of the positive electrode plates, and a plurality of first negative electrode tabs are disposed on one side of the negative electrode plates; when the plurality of positive electrode plates and the plurality of negative electrode plates are stacked, the plurality of first positive electrode tabs and the plurality of first negative electrode tabs are located on the same side, and the first positive electrode tabs at the same position on the plurality of positive electrode plates form a first positive electrode tab group, and the first negative electrode tabs at the same position on the plurality of negative electrode plates form a first negative electrode tab group; The full-pole stacked structure further includes a second positive electrode and a second negative electrode, wherein the second positive electrode is connected to the first positive electrode group and the second negative electrode is connected to the first negative electrode group; A gap is provided between the second positive electrode tab and the second negative electrode tab; The second positive electrode includes a positive electrode body, a positive electrode post connection part disposed at one end of the positive electrode body, and a plurality of positive electrode connection parts disposed on the positive electrode body. The positive electrode connection parts are connected to the first positive electrode group, and the positive electrode connection parts are disposed in a one-to-one correspondence with the first positive electrode group. Each of the positive electrode tabs protrudes from the side of the positive electrode tab body, and the positive electrode tabs are adapted to the first positive electrode tab group. The second negative electrode includes a negative electrode body, a negative electrode post connection part disposed at one end of the negative electrode body, and a plurality of negative electrode connection parts disposed on the negative electrode body. The negative electrode connection parts are connected to the first negative electrode group, and the negative electrode connection parts are disposed in a one-to-one correspondence with the first negative electrode group. Each of the negative electrode tabs protrudes from the side of the negative electrode tab body, and the negative electrode tabs are adapted to the first negative electrode tab group. There are multiple first positive electrode tabs and multiple first negative electrode tabs; the first positive electrode tabs and the first negative electrode tabs are alternately arranged, and the first positive electrode tabs and the first negative electrode tabs are on the same plane; The height of the first positive electrode ear group is different from the height of the first negative electrode ear group; When the height of the first positive electrode group is less than the height of the first negative electrode group, the second positive electrode is positioned above the second negative electrode, and the negative electrode connecting part, which is located in the position overlapping with the second positive electrode, is connected to the side of the negative electrode body through an arc. When the height of the first positive electrode ear group is greater than the height of the first negative electrode ear group, the second positive electrode ear is disposed below the second negative electrode ear, and the positive electrode ear connecting part, which is located in the position overlapping with the second negative electrode ear, is connected to the side of the positive electrode ear body through an arc.

2. The multi-tab stacked structure according to claim 1, characterized in that, When several positive electrode plates and several negative electrode plates are stacked, the first positive electrode tabs on the several positive electrode plates that are in the same position are connected to each other to form a first positive electrode tab group, and the first negative electrode tabs on the several negative electrode plates that are in the same position are connected to each other to form a first negative electrode tab group.

3. The multi-tab stacked structure according to claim 1, characterized in that, An insulating layer is provided between the second positive electrode tab and the second negative electrode tab; the insulating layer includes a first insulating layer disposed on the second positive electrode tab and / or a second insulating layer disposed on the second negative electrode tab.

4. The multi-tab stacked structure according to claim 3, characterized in that, The positive electrode body, the positive electrode post connection portion, and the positive electrode connection portion are integrally formed, and the first insulating layer is disposed on the side of the positive electrode body near the second negative electrode.

5. The multi-tab stacked structure according to claim 3, characterized in that, The negative electrode body, the negative electrode post connection portion, and the negative electrode ear connection portion are integrally formed, and the second insulating layer is disposed on the side of the negative electrode body near the second positive electrode ear.

6. The multi-tab stacked structure according to claim 1, characterized in that, Multiple first positive tabs are independently arranged, and multiple first negative tabs are independently arranged; when several positive electrode plates and several negative electrode plates are stacked, the first positive tabs and the first negative tabs are alternately arranged.

7. The multi-tab stacked structure according to claim 6, characterized in that, The height of the first positive electrode tab is different from the height of the first negative electrode tab.

8. The multi-tab stacked structure according to claim 1, characterized in that, The full-tab stacked structure is a square full-tab stacked structure; the power battery is a lithium-ion battery or a sodium-ion battery.

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