Full-tab cell and battery

Abstract

Disclosed in the present application are a full-tab cell and a battery. The full-tab cell comprises: a cathode sheet, which is wound to form a plurality of layers, wherein each layer comprises a cathode active coating area and a first empty-foil area, which are arranged side by side in the width direction of the cathode sheet, and adjacent first empty-foil areas abut against and are in communication with each other to form a first conduction portion; an anode sheet, which is stacked and wound with the cathode sheet to form a plurality of layers, wherein each layer comprises an anode active coating area and a second empty-foil area, which are arranged side by side in the width direction of the anode sheet, and adjacent second empty-foil areas abut against and are in communication with each other to form a second conduction portion; a positive tab, which is electrically connected to the cathode sheet and extends along the width direction of the cathode sheet; and a negative tab, which is electrically connected to the anode sheet and extends along the width direction of the anode sheet, wherein the first conduction portion and the second conduction portion are located on opposite sides of the cell. By means of the full-tab cell of the present application, fast charging and discharging are realized, production and processing is simpler, and the energy density of a battery is higher.

Description

Full-tab battery cells and batteries Technical Field

[0001] The present application relates to the field of new energy batteries, and in particular to a full-tab battery cell and battery. Background Art

[0002] Soft-pack lithium-ion batteries are widely used in various digital products and mobile devices. With each successive generation of these products, the demands on the battery's range and charging speed have become increasingly stringent. Typical fast-charging cells feature multiple tabs. For applications requiring particularly high charge rates, a multi-tab structure is employed to reduce impedance and increase charging and discharging speeds.

[0003] However, in the existing technology, whether it is a wound multi-pole structure or a stacked multi-pole structure, it is necessary to transfer a battery cell pole ear to the multi-pole ear, fold the pole ear and package it. The process is difficult and will also occupy a large battery space, resulting in a reduction in battery energy density.

[0004] Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a full-tab battery cell that can achieve fast charging and discharging, is simpler to produce and process, and has a higher battery energy density.

[0006] This application also proposes another full-tab battery cell;

[0007] The present application also proposes a battery using the above-mentioned full-tab battery cell.

[0008] The full-tab battery cell according to the first embodiment of the present application includes:

[0009] A cathode sheet, wherein the cathode sheet is wound to form multiple layers, each layer comprising a cathode active coating region and a first hollow foil region arranged in parallel along the width direction of the cathode sheet, each cathode active coating region and each first hollow foil region being arranged continuously, and adjacent first hollow foil regions abutting and communicating with each other to form a first conductive portion;

[0010] The anode sheet and the cathode sheet are stacked and wound to form multiple layers, each layer comprising an anode active coating area and a second hollow foil area arranged in parallel along the width direction of the anode sheet, each anode active coating area and each second hollow foil area are arranged continuously, and adjacent second hollow foil areas abut and communicate with each other to form a second conductive portion;

[0011] A positive electrode tab, electrically connected to the cathode sheet and extending along the width direction of the cathode sheet;

[0012] a negative electrode tab, electrically connected to the anode sheet and extending along the width direction of the anode sheet;

[0013] Wherein, the first conductive portion and the second conductive portion are located on two opposite sides of the battery core.

[0014] The full-tab battery cell according to the embodiment of the present application has at least the following beneficial effects:

[0015] The cathode sheet is provided with a first hollow foil area, and the anode sheet is provided with a second hollow foil area. When the battery cell is formed, the first hollow foil areas of each layer are connected to form a first conductive portion, and the second hollow foil areas of each layer are connected to form a second conductive portion. During the charge and discharge process of the battery, the current flows into the battery cell through the positive and negative tabs. Because the first hollow foil areas on each layer of the cathode sheet are connected, the second hollow foil areas on each layer of the anode sheet are also connected, which can make the charge and discharge current of each layer synchronized and uniform, achieving the fast charging effect of the current general multi-tab process. In addition, compared with the existing multi-tab structure battery cell, there is no need to perform transfer welding on the tabs and multi-tabs, making it simpler to manufacture, reducing the battery space occupied by the battery cell, and improving the energy density of the battery.

[0016] In other embodiments of the present application, along the length direction of the cathode sheet, the positive electrode tab is connected to the middle position of the cathode active coating area in the length direction, and / or, along the length direction of the anode sheet, the negative electrode sheet is connected to the middle position of the anode active coating area in the length direction.

[0017] In other embodiments of the present application, the positive electrode tab and the negative electrode tab are arranged on the same side of the battery cell.

[0018] In other embodiments of the present application, the positive electrode tab and the first conductive portion are arranged on the same side, and the negative electrode tab and the second conductive portion are arranged on the same side.

[0019] According to the second embodiment of the present application, the full-tab battery cell includes:

[0020] A plurality of cathode sheets, each of the cathode sheets comprising a cathode active coating area and a first empty foil area;

[0021] A plurality of anode sheets, each of the anode sheets comprising an anode active coating region and a second empty foil region;

[0022] A positive electrode tab, electrically connected to one of the cathode sheets;

[0023] a negative electrode tab, electrically connected to one of the anode sheets;

[0024] In which, the anode sheets and the cathode sheets are alternately stacked to form a battery cell, the first empty foil areas are stacked and adjacent first empty foil areas are abutted and connected to form a first conductive portion, and the second empty foil areas are stacked and adjacent second empty foil areas are abutted and connected to form a second conductive portion, and the first conductive portion and the second conductive portion are located on different sides of the battery cell.

[0025] In other embodiments of the present application, the first conductive portion and the second conductive portion are located on opposite sides of the battery core.

[0026] In other embodiments of the present application, the positive electrode tab and the negative electrode tab are located on the same side of the battery cell.

[0027] In other embodiments of the present application, the positive electrode tab and the negative electrode tab are located on opposite sides of the battery cell.

[0028] In other embodiments of the present application, the first conductive portion and the second conductive portion are located on two adjacent sides of the battery cell.

[0029] A battery according to a third embodiment of the present application includes:

[0030] The above-mentioned full-tab battery cell.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0033] FIG1 is a schematic diagram of a full-tab battery cell according to an embodiment of the present application;

[0034] FIG2 is a schematic diagram of a full-tab battery cell according to another embodiment of the present application;

[0035] FIG3 is a schematic diagram of a cathode sheet according to an embodiment of the present invention;

[0036] FIG4 is a schematic diagram of an anode sheet according to an embodiment of one aspect of the present application;

[0037] FIG5 is a schematic diagram of a cathode sheet in another embodiment of the present application;

[0038] FIG6 is a schematic diagram of an anode sheet according to another embodiment of the present application;

[0039] FIG7 is a schematic diagram of a full-tab battery cell according to another embodiment of the present application;

[0040] FIG8 is a schematic diagram of a full-tab battery cell according to another embodiment of the present application;

[0041] FIG9 is a schematic diagram of a cathode sheet according to an embodiment of one aspect of the present application;

[0042] FIG10 is a schematic diagram of a cathode sheet according to another embodiment of the present application.

[0043] Reference numerals: cathode sheet 100 , cathode active coating area 110 , first empty foil area 120 ; anode sheet 200 , anode active coating area 210 , second empty foil area 220 ; positive electrode tab 300 ; negative electrode tab 400 ; first conductive portion 500 ; second conductive portion 600 . DETAILED DESCRIPTION

[0044] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0045] In the description of this application, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application.

[0046] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0047] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0048] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0049] The present application proposes a full-pole ear battery cell and battery, wherein after the full-pole ear battery cell is wound or stacked, it only needs to perform simple welding on the empty foil area at the edge of the electrode sheet, and the conventional electrode sheet serves as the final exposed electrode sheet of the battery cell. During charging and discharging, the current is introduced into the foil material through the conventional electrode sheet. Because the empty foil left in each fold of the electrode sheet has been connected by welding, the charging and discharging current of each fold can be synchronized and uniform, achieving the effect of fast charging of the current general multi-electrode process, and there is no need to perform processes such as transfer welding, making the production simpler, and the battery space occupied by the battery cell can also be reduced. In order to achieve the above-mentioned purpose, the full-pole ear battery cell proposed in the present application includes a cathode sheet and an anode sheet, and there are empty foil areas on both the cathode sheet and the anode sheet. When the battery cell is manufactured, the empty foil areas are stacked correspondingly and connected. The following is a detailed description of the embodiments of the present application in conjunction with the accompanying drawings.

[0050] In some embodiments, referring to Figures 1 to 6, a full-tab wound battery cell includes a cathode sheet 100 and an anode sheet 200, wherein the cathode sheet 100 and the anode sheet 200 are stacked and wound to form a battery cell. The cathode sheet 100 and the anode sheet 200 are both wound into multiple layers, and each layer of the cathode sheet 100 has a cathode active coating area 110 and a first empty foil area 120 arranged side by side along the width direction of the cathode sheet 100. The cathode active coating areas 110 are arranged continuously, and the first empty foil areas 120 are also arranged continuously (that is, referring to Figures 3 and 5, the unfolded cathode sheet 100 is shown in the figure). After winding, the first empty foil areas 120 are stacked and abutted against each other or simply welded to form a first conductive portion 500. Each layer of the anode sheet 200 has an anode active coating area 210 and a second hollow foil area 220 arranged side by side along the width direction of the anode sheet 200. The anode active coating areas 210 are arranged continuously, and the second hollow foil areas 220 are also arranged continuously (that is, referring to Figures 4 and 6, the unfolded anode sheet 200 is the illustrated form). After winding, the second hollow foil areas 220 are stacked and abutted against each other or simply welded to form a second conductive portion 600.

[0051] It should be noted that when the cathode sheet 100 and the anode sheet 200 are wound, the anode active coating area 210 and the cathode active coating area 110 need to be set accordingly, and a diaphragm is generally provided between the cathode sheet 100 and the anode sheet 200. The length of the diaphragm corresponds to the length of the cathode sheet 100 and the anode sheet 200, and the width of the diaphragm corresponds to the width of the cathode active coating area 110 and the anode active coating area 210, so as to ensure that the charging and discharging functions are normally realized after the battery cell is formed. After the multi-layer first empty foil area 120 is connected, a first conductive part 500 is formed. After the multi-layer second empty foil area 220 is connected, a second conductive part 600 is formed. In addition, on the cathode sheet 100, there is a positive ear 300 directly electrically connected to the cathode sheet 100, and the positive ear 300 extends along the width direction of the cathode sheet 100. On the anode sheet 200, there is a negative ear 400 directly electrically connected to the anode sheet 200, and the negative electrode sheet extends along the width direction of the anode sheet 200. During the charging and discharging process, the current is introduced into the cathode sheet 100 and the anode sheet 200 through the positive ear 300 and the negative ear 400. Because the first empty foil area 120 on each layer of the cathode sheet 100 is connected, the second empty foil area 220 on each layer of the anode sheet 200 is also connected, the charging and discharging current of each layer can be made synchronous and uniform, achieving the fast charging effect of the current general multi-electrode process. Moreover, compared with the existing multi-electrode structure battery cells, there is no need to perform processes such as transfer welding between the poles and the multi-electrodes, which makes the production simpler, the space occupied by the battery cells can be reduced, and the energy density can be improved.

[0052] In some embodiments, referring to Figures 5 and 6, along the length direction of the cathode sheet 100, the positive electrode tab 300 is connected to the middle position of the cathode active coating area 110 in the length direction, and / or, along the length direction of the anode sheet 200, the negative electrode tab 400 is connected to the middle position of the anode active coating area 210 in the length direction. It can be understood that both the anode sheet 200 and the cathode sheet 100 have a large length. During the charge and discharge process, they are connected to the outside world through the positive ear 300 and the negative ear 400, and the current interacts with the outside world through the positive ear 300 and the negative ear 400. In the length direction of the cathode sheet 100 and the anode sheet 200, there are a cathode active coating area 110 and an anode active coating area 210. In the actual charge and discharge process, only the area with the active coating on the electrode will participate in the reaction, so the positive ear 300 is set in the middle position of the cathode active coating area 110, and the negative ear 400 is set in the middle position of the anode active coating area 210. During charging and discharging, the active materials at various positions on the cathode sheet 100 and the anode sheet 200 will not be too far away from the electrode sheet, and the current can quickly reach various positions of the electrode sheet, thereby further improving the charge and discharge rate of the battery.

[0053] Specifically, in some embodiments, for the convenience of description, along the length direction of the cathode sheet 100, we define the length of the cathode active coating area 110 as L1, and along the length direction of the anode sheet 200, the length of the anode active coating area 210 is L2. On the cathode sheet 100, the positive electrode ear 300 is connected at the L1 / 2 position, and on the anode sheet 200, the negative electrode ear 400 is connected at L2 / 2, so as to connect the negative electrode ear 400 and the positive electrode ear 300 in the middle position of the active coating area on the anode sheet 200 and the cathode sheet 100 to achieve better effect.

[0054] It should be noted that, in other embodiments, referring to Figures 3 and 4, the positive electrode ear 300 is connected to the edge of the cathode sheet 100, and the negative electrode ear 400 can also be connected to the edge of the anode sheet 200. Correspondingly, the cathode sheet 100 is provided with an empty foil area at the edge, and the anode sheet 200 is also provided with an empty foil area at the edge. The positive electrode ear 300 and the negative electrode ear 400 can be directly connected to the empty foil area, so that there is no need to process the active coating area of ​​the electrode sheet, thereby simplifying the production and processing steps.

[0055] In some embodiments, referring to 2, the positive tab 300 and the negative tab 400 are disposed on the same side of the battery cell. Specifically, taking the illustrated embodiment as an example, both the positive tab 300 and the negative tab 400 are disposed on one side of the first conductive portion 500. It should be noted that the first conductive portion 500 is formed by stacking and interconnecting the first hollow foil regions 120. The first hollow foil region 120 is a portion of the cathode sheet 100, to which the positive tab 300 is also connected. During the charge and discharge process, the positive tab 300 and the first conductive portion 500 have the same polarity, so the positive tab 300 can be directly connected to the first conductive portion 500. Meanwhile, the negative tab 400 is also disposed on this side, but during the charge and discharge process, the polarity of the negative tab 400 and the first conductive portion 500 are opposite. To prevent short circuits, insulation treatment is required between the first conductive portion 500 and the negative tab 400, typically using insulating glue, to prevent short circuits in the battery cell.

[0056] It can be understood that the positive tab 300 and the negative tab 400 are arranged on the same side of the battery cell. During the battery cell forming process, the space occupied by the positive tab 300 and the negative tab 400 can be further reduced, thereby improving the energy density of the battery cell.

[0057] It should be noted that in other embodiments, the positive tab 300 and the negative tab 400 are disposed on the same side of the battery cell, and both the positive tab 300 and the negative tab 400 are disposed on one side of the second conductive portion 600. Unlike the previous embodiments, the negative tab 400 and the second conductive portion 600 have the same polarity and can directly contact each other, while the positive tab 300 and the second conductive portion 600 have opposite polarities and require insulation between them to ensure normal use of the battery cell.

[0058] In some embodiments, the positive tab 300 and the negative tab 400 are located on opposite sides of the battery cell, respectively. Furthermore, the positive tab 300 is disposed on one side of the first conductive portion 500, while the negative tab 400 is disposed on one side of the second conductive portion 600. It is understood that the positive tab 300 and the first conductive portion 500 have the same polarity, while the negative tab 400 and the second conductive portion 600 have the same polarity. The positive tab 300 can directly contact and communicate with the first conductive portion 500, while the negative tab 400 can directly contact and communicate with the second conductive portion 600. Placing the tabs and conductive portions of the same polarity on the same side not only improves rapid charging and discharging of the battery cell, but also eliminates the need for insulation between the tabs and the conductive portion, thereby reducing steps in the battery cell manufacturing process and lowering the difficulty of production and processing.

[0059] According to the second aspect of the embodiment of the present application, the full-pole ear battery cell proposed includes multiple cathode sheets 100 and multiple anode sheets 200, wherein each cathode sheet 100 has a cathode active coating area 110 and a first empty foil area 120, and the cathode coating area and the first empty foil area 120 are arranged in parallel, and each anode sheet 200 has an anode active coating area 210 and a second empty foil area 220, and the anode active coating area 210 and the second empty foil area 220 are arranged in parallel, and the battery cell also has a positive ear 300 and a negative ear 400, and the positive ear 300 is electrically connected to one of the cathode sheets 100. Referring to Figures 9 and 10, the left side of the illustrated embodiment is a cathode sheet 100 connected to the positive ear 300, and the right side is a cathode sheet 100 not connected to the positive ear 300. It can be understood that there is only one cathode sheet 100 connected to the positive ear 300, and there can be multiple cathode sheets 100 not connected to the positive ear 300. The same is true for the anode sheets 200. The negative tab 400 is electrically connected to one of the anode sheets 200. There are multiple anode sheets 200 that are not connected to the negative tab 400. In addition, generally, the number of cathode sheets 100 and anode sheets 200 corresponds to each other, and each anode sheet 200 and cathode sheet 100 are alternately stacked to form a battery cell.

[0060] It should be noted that the cathode sheets 100 and the anode sheets 200 are alternately stacked to form a battery cell. The first hollow foil areas 120 on the cathode sheets 100 are stacked and connected to form a first conductive portion 500 (generally by simple welding). The second hollow foil areas 220 on the anode sheets 200 are stacked and connected to form a second conductive portion 600. In order to prevent short circuits within the battery cell and ensure normal use of the battery, the first conductive portion 500 and the second conductive portion 600 need to be located on different sides of the battery cell.

[0061] It can be understood that when the cathode sheet 100 and the anode sheet 200 are alternately stacked, the anode active coating area 210 and the cathode active coating area 110 need to correspond, and a diaphragm is generally provided between the cathode sheet 100 and the anode sheet 200. The length and width of the diaphragm correspond to the sizes of the cathode active coating area 110 and the anode active coating area 210 to realize the charging and discharging functions of the battery cell. The multiple layers of first empty foil areas 120 are connected to form a first conductive portion 500, and the multiple layers of second empty foil areas 220 are connected to form a second conductive portion 600. In addition, the cathode sheet 100 is provided with a positive electrode ear 300 that is directly electrically connected to the cathode sheet 100, and the anode sheet 200 is provided with a negative electrode ear 400 that is directly electrically connected to the anode sheet 200. During the charge and discharge process, the current is introduced into the cathode sheet 100 and the anode sheet 200 through the positive electrode ear 300 and the negative electrode ear 400. Because the first empty foil area 120 on each layer of the cathode sheet 100 is connected, and the second empty foil area 220 on each layer of the anode sheet 200 is also connected, the charge and discharge current of each layer can be synchronized and uniform, achieving the fast charging effect of the current general multi-electrode ear process. In addition, compared with the existing multi-electrode structure battery cell, there is no need to perform transfer welding and other processes on the electrode and the multi-electrode, making it simpler to manufacture, reducing the space occupied by the battery cell, and improving the energy density.

[0062] In some embodiments, referring to Figures 7 to 10, the first conductive portion 500 and the second conductive portion 600 are located on opposite sides of the battery cell. It should be noted that when the first conductive portion 500 and the second conductive portion 600 are located on opposite sides of the battery cell, the positive tab 300 and the negative tab 400 also have two settings: being located on the same side and on opposite sides (because the structural design of the battery needs to match external equipment and devices, although it is theoretically feasible for the positive tab 300 and the negative tab 400 to be located on adjacent sides, this setting is generally not considered).

[0063] In some embodiments, when the first conductive portion 500 and the second conductive portion 600 are located on opposite sides of the battery cell, the positive tab 300 and the negative tab 400 can be arranged on opposite sides of the battery cell. Referring to Figure 7, in the illustrated embodiment, the positive tab 300 and the first conductive portion 500 are located on the same side, and the negative tab 400 and the second conductive portion 600 are located on the same side. For ease of understanding, referring to the schematic diagram of a single cathode sheet 100 in Figure 9, the positive tab 300 and the first empty foil area 120 are located on the same side. When the battery cell is formed, the first conductive portion 500 is located on the same side as the positive tab 300, and the second conductive portion 600 is located on the same side as the negative tab 400. During the charge and discharge process of the battery, arranging the tabs and the conductive portion of the same polarity on the same side can not only better achieve rapid charge and discharge of the battery cell, but also eliminate the insulation treatment between the tabs and the conductive portion, thereby reducing the steps of battery cell manufacturing and processing and reducing the difficulty of production and processing.

[0064] In other embodiments, when the first conductive portion 500 and the second conductive portion 600 are located on opposite sides of the battery cell, the positive tab 300 and the negative tab 400 are also arranged on opposite sides of the battery cell, but the two tabs and the two conductive portions do not contact each other. For ease of understanding, we define the four sides of the battery cell as the first side, the second side, the third side and the fourth side, respectively, wherein the first side and the third side are arranged opposite to each other, the second side and the fourth side are arranged opposite to each other, the positive tab 300 and the negative tab 400 are arranged opposite to each other on the first side and the third side, and the first conductive portion 500 and the second conductive portion 600 are arranged opposite to each other on the second side and the fourth side.

[0065] In some embodiments, when the first conductive portion 500 and the second conductive portion 600 are arranged on opposite sides of the battery cell, the positive tab 300 and the negative tab 400 can be arranged on the same side. Referring to Figure 8, in the illustrated embodiment, the first conductive portion 500 and the second conductive portion 600 are located on opposite sides of the battery cell, the two tabs are located on the same side of the battery cell, and the tabs and the conductive portions do not contact each other. It can be understood that the positive tab 300 and the negative tab 400 are arranged on the same side, the battery cell occupies less space, the energy density of the battery can be improved, and the two tabs and the conductive portions are not arranged on the same side, and the processing process will also be simpler.

[0066] It should be noted that, in other embodiments, when the first conductive portion 500 and the second conductive portion 600 are arranged on opposite sides of the battery cell, the positive tab 300 and the negative tab 400 can be arranged on the same side, and the positive tab 300 and the negative tab 400 are arranged on one side of the first conductive portion 500 and the second conductive portion 600, that is, the two tabs and the first conductive portion 500 are arranged on the same side or the two tabs and the second conductive portion 600 are arranged on the same side. In either case, only additional insulation treatment is required. For example, if both the positive tab 300 and the negative tab 400 are arranged on one side of the first conductive portion 500, because the positive tab 300 and the first conductive portion 500 have the same polarity, they can be in direct contact, but the negative tab 400 and the first conductive portion 500 have opposite polarity, insulation treatment is required between the negative tab 400 and the first conductive portion 500 to prevent short circuit.

[0067] It can be understood that arranging the positive electrode tab 300 and the negative electrode tab 400 and one of the conductive parts on the same side can further reduce the space occupied by the tabs and the conductive part, and the energy density of the battery can be further improved.

[0068] In some embodiments, the first conductive portion 500 and the second conductive portion 600 can also be arranged on two adjacent sides. It can be understood that, similar to the previous embodiment, when the first conductive portion 500 and the second conductive portion 600 are arranged on two adjacent sides, the positive tab 300 and the negative tab 400 also have multiple settings, for example: the positive tab 300 and the negative tab 400 are arranged on the same side, wherein the positive tab 300 and the negative tab 400 can be arranged on the same side as the first conductive portion 500 or the second conductive portion 600, and insulation treatment is required between the tabs with opposite polarities and the conductive portion, the battery cell occupies less space and the battery has a higher energy density; or the positive tab 300 and the negative tab 400 are not arranged on the same side as the conductive portions, so that insulation treatment is not required, and the battery processing and production can be simpler.

[0069] In addition, there are many other situations such as the positive electrode tab 300 and the negative electrode tab 400 being arranged on two opposite sides or on two adjacent sides, but these are not preferred embodiments of the present application and will not be described in detail here.

[0070] According to the battery proposed in the embodiment of the third aspect of the present application, including the above-mentioned full-tab battery cell, it should be noted that the battery has a shell, the shell defines a cavity for accommodating the battery cell, the battery cell is placed in the shell, and then the electrolyte is injected into the shell. The positive tab 300 and the negative tab 400 on the battery cell are correspondingly connected to the positive electrode column and the negative electrode column on the shell to form a battery that can be used normally.

[0071] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application. In addition, the embodiments of the present application and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. Full-ear battery cells, including: A cathode sheet, wherein the cathode sheet is wound to form multiple layers, each layer comprising a cathode active coating area and a first empty foil area arranged in parallel along the width direction of the cathode sheet, each cathode active coating area and each first empty foil area are arranged continuously, and each adjacent first empty foil area abuts and communicates with each other to form a first conductive portion; The anode sheet and the cathode sheet are stacked and wound to form multiple layers, each layer comprising an anode active coating area and a second empty foil area arranged in parallel along the width direction of the anode sheet, each of the anode active coating areas and each of the second empty foil areas are arranged continuously, and each of the adjacent second empty foil areas abuts and communicates with each other to form a second conductive portion; A positive electrode tab, electrically connected to the cathode sheet and extending along the width direction of the cathode sheet; A negative electrode ear, electrically connected to the anode sheet and extending along the width direction of the anode sheet; Wherein, the first conducting portion and the second conducting portion are located on two opposite sides of the battery core.

2. The full-tab battery cell according to claim 1, wherein: Along the length direction of the cathode sheet, the positive electrode tab is connected to the middle position of the cathode active coating area in the length direction, and / or, along the length direction of the anode sheet, the negative electrode sheet is connected to the middle position of the anode active coating area in the length direction.

3. The full-tab battery cell according to claim 1, wherein: The positive electrode tab and the negative electrode tab are arranged on the same side of the battery cell.

4. The full-tab battery cell according to claim 1, wherein: The positive electrode tab and the first conductive portion are arranged on the same side, and the negative electrode tab and the second conductive portion are arranged on the same side.

5. Full-ear battery cells, including: A plurality of cathode sheets, each of which comprises a cathode active coating area and a first empty foil area; A plurality of anode sheets, each of which comprises an anode active coating region and a second empty foil region; A positive electrode ear, electrically connected to one of the cathode sheets; A negative electrode ear, electrically connected to one of the anode sheets; Among them, each of the anode sheets and each of the cathode sheets are alternately stacked to form a battery cell, each of the first empty foil areas are stacked and adjacent first empty foil areas are abutted and connected to form a first conductive portion, each of the second empty foil areas are stacked and adjacent second empty foil areas are abutted and connected to form a second conductive portion, and the first conductive portion and the second conductive portion are located on different sides of the battery cell.

6. The full-tab battery cell according to claim 5, wherein: The first conductive portion and the second conductive portion are located on two opposite sides of the battery core.

7. The full-tab battery cell according to claim 6, wherein: The positive electrode tab and the negative electrode tab are located on the same side of the battery cell.

8. The full-tab battery cell according to claim 6, wherein: The positive electrode tab and the negative electrode tab are located on two opposite sides of the battery cell.

9. The full-tab battery cell according to claim 5, wherein: The first conductive portion and the second conductive portion are located on two adjacent sides of the battery cell.

10. Batteries, including: The full-tab battery cell according to any one of claims 1 to 9.

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