Battery cell, battery, battery pack, and electric device

Abstract

The utility model provides a kind of electric core, battery, battery pack and electric equipment, wherein electric core, including multilayer pole piece structure and adapter piece;Multilayer pole piece structure is stacked and is set, and the same polarity multiple pole piece structures in multilayer pole piece structure include multiple tab structure, all tab structures are connected with adapter piece, multiple tab structures include first tab group and the second tab group being adjacent to the setting of first tab group, first tab group includes multiple first tab, and second tab group includes multiple second tab;The height of any first tab is greater than the height of any second tab, the first tab of maximum height in first tab group is highest tab, and the second tab of minimum height in second tab group is lowest tab, wherein, the height H1 between highest tab and the height H2 of lowest tab satisfies:3mm≦H1-H2≦30mm.The technical scheme of the application effectively solves the problem that the related technology is tab lapped to pole, so that the welding quality of pole and adapter piece is poor.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery cell, a battery, a battery pack, and an electrical device. Background Technology

[0002] Currently, a battery cell consists of multiple tabs of the same height. These tabs are pre-soldered together, then welded to an adapter, which in turn is welded to the terminal. The tallest tab among the pre-soldered tabs is most likely to overlap with the terminal. Welding is achieved based on the adapter and the terminal. Because the tab overlaps with the terminal, welding requires contacting the adapter, the terminal, and the tab together, resulting in poor weld quality between the terminal and the adapter. Utility Model Content

[0003] The main purpose of this utility model is to provide a battery cell, battery, battery pack and electrical equipment to solve the problem in related technologies where the tabs are connected to the terminals, resulting in poor welding quality between the terminals and the adapter.

[0004] To achieve the above objectives, according to one aspect of the present invention, a battery cell is provided, comprising a multilayer electrode structure and an adapter; the multilayer electrode structures are stacked, with adjacent electrode structures having opposite polarities; multiple electrode structures of the same polarity in the multilayer electrode structure include multiple tab structures; all tab structures are connected to the adapter; the multiple tab structures include a first tab group and a second tab group adjacent to the first tab group; the first tab group includes multiple first tabs, and the second tab group includes multiple second tabs; the height of any first tab is greater than the height of any second tab; the first tab with the largest height in the first tab group is the highest tab, and the second tab with the smallest height in the second tab group is the lowest tab; wherein the height H1 of the highest tab and the height H2 of the lowest tab satisfy the following condition: 3mm ≤ H1 - H2 ≤ 30mm.

[0005] According to another aspect of the present invention, a battery is provided, including a cell, wherein the cell is the aforementioned cell.

[0006] According to another aspect of the present invention, a battery pack is provided, comprising a plurality of batteries, wherein the batteries are those described above.

[0007] According to another aspect of the present invention, an electrical device is provided, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0008] The battery cell, using the technical solution of this utility model, includes a multi-layer electrode structure and an adapter. The multi-layer electrode structures are stacked, with adjacent layers having opposite polarities. Multiple electrode structures of the same polarity within the multi-layer electrode structure include multiple tab structures. All tab structures are connected to the adapter. Each tab structure includes a first tab group and a second tab group adjacent to the first tab group. The first tab group includes multiple first tabs, and the second tab group includes multiple second tabs. The height of any first tab is greater than the height of any second tab. The first tab with the largest height in the first tab group is the highest tab, and the second tab with the smallest height in the second tab group is the lowest tab. The height H1 of the highest tab and the height H2 of the lowest tab satisfy the following condition: 3mm ≤ H1 - H2 ≤ 30mm. In this way, by limiting the difference between the height H1 of the highest electrode and the height H2 of the lowest electrode to between 3mm and 30mm before pre-welding all electrode structures, it is possible to prevent the highest electrode from overlapping with the pole after pre-welding. The highest electrode will not affect the welding between the adapter and the pole, thus improving the welding quality of the pole and the adapter. Therefore, the technical solution of this application effectively solves the problem in related technologies where the electrode overlaps with the pole, resulting in poor welding quality between the pole and the adapter. Attached Figure Description

[0009] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0010] Figure 1 A schematic diagram of the unfolded positive electrode bodies of a battery cell according to Embodiment 1 of the present invention is shown.

[0011] Figure 2 It shows Figure 1 An enlarged schematic diagram of point A of the battery cell;

[0012] Figure 3 A schematic diagram of the unfolded multiple negative electrode bodies of a battery cell according to Embodiment 1 of the present invention is shown.

[0013] Figure 4 A partial top view of the multi-layer electrode structure of the battery cell according to Embodiment 1 of the present invention is shown.

[0014] Figure 5 A schematic diagram of the unfolded positive electrode bodies of a second embodiment of the battery cell according to the present invention is shown.

[0015] Figure 6 A three-dimensional structural diagram of two battery cells connected by an adapter according to the present invention is shown.

[0016] Figure 7 It shows Figure 6 An enlarged schematic diagram of point B of the two battery cells.

[0017] The above figures include the following reference numerals:

[0018] 10. Electrode structure; 101. First electrode lug group; 102. Second electrode lug group; 11. Electrode structure; 111. First electrode lug; 111A. Highest electrode lug; 112. Second electrode lug; 112A. Lowest electrode lug; 113. Third electrode lug; 12. Positive electrode body; 13. Negative electrode body; 20. Adapter. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] According to one aspect of this application, a battery cell is provided, such as... Figures 1 to 4 and Figure 6 and Figure 7 As shown, the first embodiment of the battery cell includes a multilayer electrode structure 10 and an adapter 20. The multilayer electrode structures 10 are stacked, with adjacent electrode structures 10 having opposite polarities. Multiple electrode structures 10 of the same polarity in the multilayer electrode structure 10 include multiple tab structures 11. All tab structures 11 are connected to the adapter 20. The multiple tab structures 11 include a first tab group 101 and a second tab group 102 disposed adjacent to the first tab group 101. The first tab group 101 includes multiple first tabs 111, and the second tab group 102 includes multiple second tabs 112. The height of any first electrode tab 111 is greater than the height of any second electrode tab 112. The first electrode tab 111 with the largest height in the first electrode tab group 101 is the highest electrode tab 111A, and the second electrode tab 112 with the smallest height in the second electrode tab group 102 is the lowest electrode tab 112A. The height H1 of the highest electrode tab 111A and the height H2 of the lowest electrode tab 112A satisfy the following condition: 3mm≦H1-H2≦30mm.

[0023] According to the technical solution of Embodiment 1 of the battery cell, the battery cell includes a multilayer electrode structure 10 and an adapter 20. The multilayer electrode structures 10 are stacked, and the polarities of adjacent electrode structures 10 are opposite. Multiple electrode structures 10 of the same polarity in the multilayer electrode structure 10 include multiple tab structures 11. All tab structures 11 are connected to the adapter 20. The multiple tab structures 11 include a first tab group 101 and a second tab group 102 disposed adjacent to the first tab group 101. The first tab group 101 includes multiple first tabs 111, and the second tab group 102 includes multiple second tabs 112. The height of any first tab 111 is greater than the height of any second tab 112. The first tab 111 with the largest height in the first tab group 101 is the highest tab 111A, and the second tab 112 with the smallest height in the second tab group 102 is the lowest tab 112A. The height H1 of the highest tab 111A and the height H2 of the lowest tab 112A satisfy the condition: 3mm ≤ H1 - H2 ≤ 30mm. Thus, before pre-welding all tab structures 11, by limiting the difference between the height H1 of the highest tab 111A and the height H2 of the lowest tab 112A to between 3mm and 30mm, it is possible to prevent the highest tab 111A from overlapping onto the pole after pre-welding all tab structures 11. The highest tab 111A will not affect the welding between the adapter 20 and the pole, thereby improving the welding quality between the pole and the adapter 20. Therefore, the technical solution of Embodiment 1 of the battery cell effectively solves the problem in related technologies where the tabs overlap with the terminals or the overcurrent area, resulting in poor welding quality between the terminals and the adapter. Furthermore, it avoids the highest tab 111A overlapping with the overcurrent area after all tab structures 11 are pre-welded, thus ensuring that the overcurrent area can break down normally.

[0024] It should be noted that the multi-layer electrode structure 10 stacking configuration refers to the multi-layer electrode structure 10 being wound or stacked.

[0025] Preferably, the difference between the height H1 of the highest tab 111A and the height H2 of the lowest tab 112A is 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm or 21mm or 22mm or 23mm or 24mm or 25mm or 26mm or 27mm or 28mm or 29mm or 30mm.

[0026] like Figures 1 to 4As shown, in order to optimize the internal structure of the battery cell and avoid the possibility of the highest tab 111A touching the terminal post or the overcurrent area, in the thickness direction of the battery cell, each electrode structure 10 with a first tab 111 includes a first tab 111, and each electrode structure 10 with a second tab 112 includes a second tab 112. The difference between the highest tab 111AH1 and the lowest tab 112AH2 satisfies: 3mm≦H1-H2≦30mm.

[0027] Preferably, the difference between the highest tab 111AH1 and the lowest tab 112AH2 is 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm or 21mm or 22mm or 23mm or 24mm or 25mm or 26mm or 27mm or 28mm or 29mm or 30mm.

[0028] In other embodiments, each electrode structure 10 includes two tab structures 11 in the thickness direction of the battery cell, with the highest tab 111AH1 and the lowest tab 112AH2 satisfying the following condition: 2mm ≤ H1 - H2 ≤ 40mm. By controlling the height difference between the highest tab 111AH1 and the lowest tab 112AH2, it is ensured that even in the configuration of the dual tab structure 11, the highest tab 111A will not overlap with the terminal post or the current-carrying area after pre-soldering, thus ensuring the smooth progress of subsequent welding processes.

[0029] Preferably, the difference between the highest tab 111AH1 and the lowest tab 112AH2 is 2mm or 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm or 21mm or 22mm or 23mm or 24mm or 25mm or 26mm or 27mm or 28mm or 29mm or 30mm or 31mm or 32mm or 33mm or 34mm or 35mm or 36mm or 37mm or 38mm or 39mm or 40mm.

[0030] Specifically, each electrode structure 10 having a first tab 111 includes two first tabs 111, each electrode structure 10 having a second tab 112 includes two second tabs 112, and each electrode structure 10 having a third tab 113 (see below) includes two third tabs 113.

[0031] like Figures 1 to 4 As shown, the positive electrode structure 10 in the multilayer electrode structure 10 also includes multiple positive electrode bodies 12, and the negative electrode structure 10 also includes multiple negative electrode bodies 13. The thickness T1 of each positive electrode body 12 satisfies: 8um≦T1≦22um, and the thickness T2 of each negative electrode body 13 satisfies: 3um≦T2≦10um. The distance between the highest tab 111AH1 and the lowest tab 112AH2 satisfies: 3mm≦H1-H2≦30mm. By controlling the thickness of the positive electrode body 12 and the negative electrode body 13, it can be ensured that the highest tab 111A will not overlap with the electrode post or the current flow area after pre-welding, thus ensuring the smooth progress of subsequent welding processes.

[0032] Preferably, the thickness T1 of each positive electrode body 12 is 8um or 9um or 10um or 11um or 12um or 13um or 14um or 15um or 16um or 17um or 18um or 19um or 20um or 21um or 22um.

[0033] Preferably, the thickness T2 of each negative electrode body 13 is 3um, 4um, 5um, 6um, 7um, 8um, 9um, or 10um.

[0034] It should be noted that the positive electrode body 12 mentioned above refers to the part of the positive electrode structure 10 without the positive electrode tab structure 11, and the negative electrode body 13 mentioned above refers to the part of the negative electrode structure 10 without the negative electrode tab structure 11. The positive electrode structure 10 is an aluminum foil, and the negative electrode structure 10 is a copper foil.

[0035] The positive electrode tab structure 11 is disposed on one side of the positive electrode body 12 and is separately / integrated with the positive electrode body 12. It is electrically connected to the positive electrode body 12 to conduct current from the corresponding positive electrode body 12. The negative electrode tab structure 11 is disposed on one side of the negative electrode body 13 and is separately / integrated with the negative electrode body 13. It is electrically connected to the negative electrode body 13 to conduct current from the corresponding negative electrode body 13.

[0036] In Embodiment Two of the battery cell, the difference from Embodiment One is that, as Figure 5As shown, the multiple tab structures 11 also include a third tab group 103, which is located between the first tab group 101 and the second tab group 102. The third tab group 103 includes multiple third tabs 113, each with the same height. The height of the third tab 113 is greater than the height of the lowest tab 112A and less than the height of the highest tab 111A. Specifically, the height H3 of the third tab 113 satisfies the following relationship with the lowest tab 112AH2: 2mm ≤ H3 - H2 ≤ 15mm; the height of the highest tab 111AH1 satisfies the following relationship with the lowest tab 112AH2: 3mm ≤ H1 - H2 ≤ 30mm. By setting the height of the third tab 113 between the highest tab 111A and the lowest tab 112A, a transition zone is formed, which helps reduce the possibility of the highest tab 111A overlapping the pole or the current-carrying area.

[0037] Preferably, the difference between the height H3 of the third electrode 113 and the lowest electrode 112AH2 is 2mm or 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm.

[0038] The difference between the highest tab 111AH1 and the lowest tab 112AH2 is 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm or 21mm or 22mm or 23mm or 24mm or 25mm or 26mm or 27mm or 28mm or 29mm or 30mm.

[0039] In the second embodiment of the battery cell, each electrode structure 10 having a first tab 111 includes a first tab 111, each electrode structure 10 having a second tab 112 includes a second tab 112, and each electrode structure 10 having a third tab 113 includes a third tab 113.

[0040] like Figures 1 to 4 As shown, the highest tab 111AH1 satisfies: 11mm≦H1≦70mm; and / or, the lowest tab 112AH2 satisfies: 8mm≦H2≦40mm. Defining the specific height range of the highest tab 111A and / or the lowest tab 112A facilitates processing and production, ensures cell consistency, and improves cell manufacturing precision.

[0041] Preferably, the maximum electrode 111AH1 is 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm or 21mm or 22mm or 23mm or 24mm or 25mm or 26mm or 27mm or 28mm or 29mm or 30mm or 31mm or 32mm or 33mm or 34mm or 35mm or 36mm or 37mm or 38mm or 39mm. Or 40mm or 41mm or 42mm or 43mm or 44mm or 45mm or 46mm or 47mm or 48mm or 49mm or 50mm or 51mm or 52mm or 53mm or 54mm or 55mm or 56mm or 57mm or 58mm or 59mm or 60mm or 61mm or 62mm or 63mm or 64mm or 65mm or 66mm or 67mm or 68mm or 69mm or 70mm.

[0042] The lowest electrode diameter of 112AH2 is 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm or 21mm or 22mm or 23mm or 24mm or 25mm or 26mm or 27mm or 28mm or 29mm or 30mm or 31mm or 32mm or 33mm or 34mm or 35mm or 36mm or 37mm or 38mm or 39mm or 40mm.

[0043] like Figures 1 to 4 As shown, in order to meet the requirements of different thicknesses of battery cells and different overcurrent requirements, the ratio of the sum of the thicknesses of all first tabs 111 in the first tab group 101 to the thickness of the battery cell is in the range of 10%-40%, and the ratio of the sum of the thicknesses of all second tabs 112 in the second tab group 102 to the thickness of the battery cell is in the range of 10%-40%.

[0044] The ratio of the sum of the thicknesses of all the aforementioned first tabs 111 to the thickness of the battery cell is preferably 10% or 11% or 12% or 13% or 14% or 15% or 16% or 17% or 18% or 19% or 20% or 21% or 22% or 23% or 24% or 25% or 26% or 27% or 28% or 29% or 30% or 31% or 32% or 33% or 34% or 35% or 36% or 37% or 38% or 39% or 40%.

[0045] The ratio of the sum of the thicknesses of all the second tabs 112 in the second tab group 102 to the thickness of the battery cell is preferably 10% or 11% or 12% or 13% or 14% or 15% or 16% or 17% or 18% or 19% or 20% or 21% or 22% or 23% or 24% or 25% or 26% or 27% or 28% or 29% or 30% or 31% or 32% or 33% or 34% or 35% or 36% or 37% or 38% or 39% or 40%.

[0046] In other embodiments, to optimize the internal structure of the battery cell and avoid the possibility of the highest tab 111A overlapping with the terminal post or the overcurrent area, each electrode structure 10 with a first tab 111 includes two first tabs 111 in the thickness direction of the battery cell, and each electrode structure 10 with a second tab 112 includes one second tab 112; the highest tab 111AH1 and the lowest tab 112 satisfy the following condition: 3mm ≤ H1-H2 ≤ 40mm. Furthermore, the different configurations of the number of first tabs 111 and second tabs 112 in each electrode structure 10 can be adapted to the range of possible applications of the actual battery cell.

[0047] Preferably, the difference between the highest tab 111AH1 and the lowest tab 112AH2 is 3mm or 4mm or 5mm or 6mm or 7mm or 8mm or 9mm or 10mm or 11mm or 12mm or 13mm or 14mm or 15mm or 16mm or 17mm or 18mm or 19mm or 20mm or 21mm or 22mm or 23mm or 24mm or 25mm or 26mm or 27mm or 28mm or 29mm or 30mm or 31mm or 32mm or 33mm or 34mm or 35mm or 36mm or 37mm or 38mm or 39mm or 40mm.

[0048] In other embodiments, each electrode structure 10 having a first tab 111 includes two first tabs 111, and each electrode structure 10 having a second tab 112 includes one second tab 112.

[0049] In other embodiments, each electrode structure 10 having a first tab 111 includes one first tab 111, and each electrode structure 10 having a second tab 112 includes two second tabs 112.

[0050] like Figure 6 and Figure 7As shown, in the thickness direction of the battery cell, all the tab structures 11 of the multiple electrode structures 10 of the same polarity in the multilayer electrode structure 10 move closer to and overlap with the adapter 20, so that the end faces of all the tab structures 11 of the multiple electrode structures 10 of the same polarity in the multilayer electrode structure 10 are flush. In this way, before the multiple tab structures 11 are pre-welded, the end faces of all the tab structures 11 of the multiple electrode structures 10 of the same polarity are flush, and after the tab structures 11 are pre-welded, they remain flush, eliminating the need for cutting operations. This ensures that the end faces of all the tab structures 11 of the multiple electrode structures 10 of the same polarity are flush, saving the need for cutting operations, preventing the generation of debris during cutting, and avoiding affecting the production yield of the battery cell.

[0051] It should be noted that the "alignment" in this application is not absolute alignment, but rather alignment within a certain error range, which is between 2mm and 20mm.

[0052] like Figures 1 to 4 As shown, the multi-layer electrode structure 10 is wound up, with each first tab 111 having the same height and each second tab 112 having the same height. The highest tab 111A and the lowest tab 112A are arranged adjacent to each other. The wound electrode structure 10 design, combined with the first tabs 111 and second tabs 112 of the same height, facilitates efficient use of the cell space and improves the energy density of the cell. At the same time, the adjacent arrangement of the highest tab 111A and the lowest tab 112A simplifies the pre-soldering and cutting processes and avoids the possibility of the highest tab 111A overlapping with the terminal post or the current-carrying area.

[0053] The adapter 20 is preferably an adapter piece, which is preferably a conductive structure. Any adjacent positive electrode body 12 and negative electrode body 13 are separated by a separator.

[0054] The positive electrode body 12 includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer. The positive electrode current collector without the positive electrode active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0055] The negative electrode body 13 includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer. The negative electrode current collector without the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0056] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure. A wound cell is generally manufactured by winding continuous positive and negative electrodes and a separator, with the separator located between adjacent positive and negative electrodes. A stacked cell is manufactured by stacking positive and negative electrodes and a separator, where the positive and negative electrodes are separated by a separator, and adjacent layers of positive and / or negative electrodes within the cell are discontinuous. The stacking process includes layering or Z-shaped folding, etc. The embodiments of this application are not limited to these.

[0057] The battery cell may have terminals or other components that connect to the adapter 20, serving as the electrical connection points of the battery cell. Furthermore, the battery cell typically includes a pressure relief section. In the event of excessive internal pressure (e.g., thermal runaway), this section releases substances (e.g., gases, liquids, particulate matter) from within the cell, reducing internal pressure and preventing rapid pressurization that could lead to dangerous accidents such as cell explosion. For example, the pressure relief section can be an explosion-proof valve, explosion-proof plate, etc.

[0058] It should be noted that this application Figures 1 to 3 and Figure 5 The thick vertical lines in the image represent the creases left after the wound battery cell is unwound.

[0059] According to another aspect of this application, a battery is provided, an embodiment of which includes a battery cell, the battery cell being the aforementioned battery cell. Since the aforementioned battery cell is a battery cell, the battery including this cell can also solve the problem in the related art where the tabs are connected to the terminals or overcurrent areas, resulting in poor welding quality between the terminals and the adapter.

[0060] The battery can be a single battery cell or a battery module. When the battery is a battery module, it can be composed of multiple single battery cells connected in series, parallel, or a combination thereof to form a battery module. Multiple battery modules can then be connected in series, parallel, or a combination thereof to form a whole. There can be multiple battery modules, such as four or eight, without any specific limitation. The battery pack may also include a housing, with one end open and connected to a heat exchange plate. The battery modules are housed inside the housing.

[0061] The aforementioned battery cells can be secondary or primary batteries, and can also be lithium-ion batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, etc., but this embodiment of the invention is not limited to these. Battery cells can be cylindrical, flat, cuboid, or other shapes, etc., but this embodiment of the invention is not limited to these shapes either. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, but this embodiment of the invention is not limited to these types either.

[0062] For example, a battery cell may include a casing, a cell, and an electrolyte, with the casing housing the cell and electrolyte. The cell also includes a separator. The battery cell primarily functions by the movement of metal ions between the positive electrode body 12 and the negative electrode body 13.

[0063] According to another aspect of this application, a battery pack is provided, wherein embodiments of the battery pack include a plurality of batteries, the batteries being the aforementioned batteries. Since the aforementioned batteries are batteries of the battery pack, the battery pack including these batteries can also solve the problem in the related art where the tabs are connected to the terminals or overcurrent areas, resulting in poor welding quality between the terminals and the adapters.

[0064] According to another aspect of this application, an electrical device is provided, an embodiment of which includes a battery pack, the battery pack being the aforementioned battery pack. The battery pack is capable of providing electrical energy to the electrical device. Since the aforementioned battery pack is the battery pack for the electrical device, the electrical device including this battery pack can also solve the problem in the related art where the tabs are connected to the terminals or overcurrent areas, resulting in poor welding quality between the terminals and the adapter.

[0065] The electrical equipment disclosed in this utility model embodiment can be, but is not limited to, vehicles, mobile phones, tablets, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be fuel-powered vehicles, natural gas vehicles, new energy vehicles, or rail vehicles; new energy vehicles can be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. When the electrical equipment is a vehicle, the battery pack can be located at the bottom, front, or rear of the vehicle.

[0066] In the description of this utility model, it should be understood that "multiple" means a quantity of two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0067] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0068] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0069] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cell, characterized in that, It includes a multi-layer electrode structure (10) and an adapter (20); The multiple electrode structures (10) are stacked, and the polarities of the electrode structures (10) in adjacent layers are opposite. The multiple electrode structures (10) of the same polarity in the multiple electrode structures (10) include multiple electrode tab structures (11). All electrode tab structures (11) are connected to the adapter (20). The multiple electrode tab structures (11) include a first electrode tab group (101) and a second electrode tab group (102) arranged adjacent to the first electrode tab group (101). The first electrode tab group (101) includes multiple first electrode tabs (111), and the second electrode tab group (102) includes multiple second electrode tabs (112). The height of any first electrode tab (111) is greater than the height of any second electrode tab (112). The first electrode tab (111) with the largest height in the first electrode tab group (101) is the highest electrode tab (111A), and the second electrode tab (112) with the smallest height in the second electrode tab group (102) is the lowest electrode tab (112A). The height H1 of the highest electrode tab (111A) and the height H2 of the lowest electrode tab (112A) satisfy the following condition: 3mm ≦ H1 - H2 ≦ 30mm.

2. The battery cell according to claim 1, characterized in that, In the thickness direction of the cell, each electrode structure (10) having the first tab (111) includes one first tab (111), and each electrode structure (10) having the second tab (112) includes one second tab (112). The difference between the highest tab (111A)H1 and the lowest tab (112A)H2 satisfies: 3mm≦H1-H2≦30mm.

3. The battery cell according to claim 1, characterized in that, In the thickness direction of the cell, each electrode structure (10) includes two tab structures (11), wherein the highest tab (111A)H1 and the lowest tab (112A)H2 satisfy the following condition: 2mm≦H1-H2≦40mm.

4. The battery cell according to claim 1, characterized in that, The positive electrode structure (10) in the multilayer electrode structure (10) further includes multiple positive electrode bodies (12), and the negative electrode structure (10) in the multilayer electrode structure (10) further includes multiple negative electrode bodies (13). The thickness T1 of each positive electrode body (12) satisfies: 8um≦T1≦22um, and the thickness T2 of each negative electrode body (13) satisfies: 3um≦T2≦10um. The highest tab (111A)H1 and the lowest tab (112A)H2 satisfy: 3mm≦H1-H2≦30mm.

5. The battery cell according to claim 1, characterized in that, The plurality of said tab structures (11) further include a third tab group (103), the third tab group (103) being located between the first tab group (101) and the second tab group (102), the third tab group (103) including a plurality of third tabs (113), each of the third tabs (113) being of equal height, the height of the third tab (113) being greater than the height of the lowest tab (112A), and the height of the third tab (113) being less than the height of the highest tab (111A); wherein, The height H3 of the third electrode (113) and the lowest electrode (112A) H2 satisfy the following: 2mm≦H3-H2≦15mm; the height H1 of the highest electrode (111A) and the lowest electrode (112A) H2 satisfy the following: 3mm≦H1-H2≦30mm.

6. The battery cell according to claim 1, characterized in that, The highest tab (111A)H1 satisfies: 11mm≦H1≦70mm; and / or, the lowest tab (112A)H2 satisfies: 8mm≦H2≦40mm.

7. The battery cell according to claim 1, characterized in that, The ratio of the sum of the thicknesses of all the first tabs (111) in the first tab group (101) to the thickness of the battery cell is in the range of 10%-40%, and the ratio of the sum of the thicknesses of all the second tabs (112) in the second tab group (102) to the thickness of the battery cell is in the range of 10%-40%.

8. The battery cell according to claim 1, characterized in that, In the thickness direction of the cell, each electrode structure (10) having the first tab (111) includes two first tabs (111), and each electrode structure (10) having the second tab (112) includes one second tab (112); or, each electrode structure (10) having the first tab (111) includes one first tab (111), and each electrode structure (10) having the second tab (112) includes two second tabs (112); the highest tab (111A)H1 and the lowest tab (112A)H2 satisfy the following: 3mm≦H1-H2≦40mm.

9. The battery cell according to claim 1, characterized in that, In the thickness direction of the cell, all the tab structures (11) of the multiple electrode structures (10) of the same polarity in the multilayer electrode structure (10) move closer to and overlap the adapter (20) so that the end faces of all the tab structures (11) of the multiple electrode structures (10) of the same polarity in the multilayer electrode structure (10) are flush.

10. The battery cell according to claim 1, characterized in that, The multi-layered electrode structure (10) is wound up, with each first electrode tab (111) having the same height and each second electrode tab (112) having the same height, and the highest electrode tab (111A) and the lowest electrode tab (112A) being arranged adjacent to each other.

11. A battery, comprising a cell, characterized in that, The battery cell is the battery cell according to any one of claims 1 to 10.

12. A battery pack comprising a plurality of batteries, characterized in that, The battery is the battery as described in claim 11.

13. An electrical device, comprising a battery pack, characterized in that, The battery pack is the battery pack according to claim 12.

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