Battery cell, battery, and electronic device

Abstract

A battery cell (10), a battery, and an electronic device. The battery cell (10) comprises: a main body (100) formed by stacking a first electrode sheet (200) and a second electrode sheet (300) and then winding same, wherein the main body (100) comprises a first surface (110) and a second surface (120) opposite to each other; a first main tab (400) connected to the first electrode sheet (200) and protruding from the first surface (110); and a first conductive member (500), comprising a plurality of first auxiliary tabs (510), wherein the plurality of first auxiliary tabs (510) are all connected to the first electrode sheet (200), the plurality of first auxiliary tabs (510) are stacked in the thickness direction and welded to define an intermediate surface (600), the intermediate surface (600) divides the second surface (120) into a first portion (121) and a second portion (122) in the length direction of the main body (100), the first conductive member (500) is bent and connected to the first portion (121), and the first conductive member (500) is attached to the second portion (122). The battery cell (10) has high energy density.

Description

Battery cell, battery and electronic device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery and an electronic device. BACKGROUND

[0002] In the related art, after the pole piece is wound to form a battery cell, the battery cell is charged and discharged with the outside through the pole lug. In order to improve the charging efficiency of the battery cell, the existing battery cell is provided with a plurality of false pole lugs during manufacturing. Specifically, the battery cell is provided with a true pole lug and a plurality of false pole lugs. The true pole lug is mainly responsible for circuit conduction with the outside, and the plurality of false pole lugs are welded together. In this way, when the current from the outside enters the battery cell through the true pole lug, the current can pass through each layer of pole pieces through the plurality of false pole lugs, which can improve the charging efficiency. However, after the plurality of false pole lugs are provided, the energy density of the battery is low.

[0003] SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the prior art. To this end, the present application provides a battery cell which can have a high energy density.

[0005] The present application also provides a battery.

[0006] The present application also provides an electronic device.

[0007] The battery cell according to the first aspect of the present application comprises:

[0008] a main body formed by winding the first pole piece and the second pole piece after being stacked, the main body comprising a first face and a second face opposite to each other;

[0009] a first true pole lug connected to the first pole piece and protruding relative to the first face;

[0010] a first conductive member comprising a plurality of first false pole lugs, the plurality of first false pole lugs being connected to the first pole piece, the plurality of first false pole lugs being stacked and welded along the thickness direction to define a middle face, the middle face dividing the second face into a first part and a second part along the length direction of the main body, the first conductive member being bent and connected to the first part, and the first conductive member being attached to the second part.

[0011] According to the battery cell provided in the embodiments of the present application, the first conductive member includes a plurality of first false tabs, and after the plurality of first false tabs are laminated and welded, the current can pass through the first conductive member to each position of the first tab, which can improve the charging efficiency of the battery cell. In particular, the battery cell has a high energy density.

[0012] According to the battery cell provided in some embodiments of the present application, the battery cell further includes a first adhesive layer, and the first adhesive layer is used to fix one end of the first conductive member on the main body.

[0013] According to the battery cell provided in some embodiments of the present application, the battery cell further includes two third surfaces, two ends of the second surface are respectively connected to one end of the two third surfaces, two ends of the first surface are respectively connected to the other end of the two third surfaces, one end of the first adhesive layer is bonded to the first conductive member, and the other end of the first adhesive layer is bonded to the third surface.

[0014] According to the battery cell provided in some embodiments of the present application, when the first tab and the second tab are laminated and flattened, the first tab includes a plurality of first body portions and a plurality of second body portions, the first body portions and the second body portions are alternately arranged along the length direction of the first tab, each first body portion is connected to a first false tab, and the first false tab protrudes from the second body portion.

[0015] According to the battery cell provided in some embodiments of the present application, the first false tab and the first body portion are in an integrated structure. According to the battery cell provided in some embodiments of the present application, along the thickness direction of the main body, the size of the main body is L1, and the size of the first conductive member is L2, and L2 < L1.

[0016] According to the battery cell provided in some embodiments of the present application, the battery cell further includes a second true tab and a second conductive member, the second true tab is connected to the second tab and protrudes relative to the first surface, the second conductive member includes a plurality of second false tabs, each of the plurality of second false tabs is connected to the second tab, the plurality of second false tabs are laminated and welded along the thickness direction, the second conductive member is bent and connected to the first portion, and the second conductive member is attached to the second portion.

[0017] According to the battery cell provided in some embodiments of the present application, the battery cell further includes a second adhesive layer, and the second adhesive layer is used to fix one end of the second conductive member on the main body.

[0018] The battery according to the second aspect of the present application includes the battery cell according to any one of the first aspect of the present application.

[0019] The battery according to the present application has at least the following beneficial effects: the first conductive member includes a plurality of first false tabs, after the plurality of first false tabs are laminated and welded, the current can pass through the first conductive member to each position of the first tab, which can improve the charging efficiency of the battery cell, and after the first conductive member is bent and connected to the first part and the first conductive member is attached to the second part, the first conductive member will not occupy the space of the battery cell in the length direction, which can effectively improve the energy density of the battery cell. Specifically, the battery cell has a high energy density. Further, the battery has a high energy density.

[0020] The electronic device according to the third aspect of the present application includes the battery according to the second aspect of the present application.

[0021] The electronic device according to the present application has at least the following beneficial effects: the first conductive member includes a plurality of first false tabs, after the plurality of first false tabs are laminated and welded, the current can pass through the first conductive member to each position of the first tab, which can improve the charging efficiency of the battery cell, and after the first conductive member is bent and connected to the first part and the first conductive member is attached to the second part, the first conductive member will not occupy the space of the battery cell in the length direction, which can effectively improve the energy density of the battery cell. Specifically, the battery cell has a high energy density. Further, the battery has a high energy density. Still further, the electronic device with the battery has a good endurance.

[0022] Additional aspects and advantages of the present application will be made apparent from the following description of the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in conjunction with the accompanying drawings and embodiments, wherein:

[0024] FIG. 1 is a schematic view of a battery cell according to a first embodiment of the present application;

[0025] FIG. 2 is a schematic view of a battery cell according to a second embodiment of the present application;

[0026] FIG. 3 is an enlarged schematic view of A in FIG. 2;

[0027] FIG. 4 is a partial schematic view of a battery cell according to a third embodiment of the present application;

[0028] FIG. 5 is a schematic view of a first tab in a battery cell according to some embodiments of the present application;

[0029] FIG. 6 is a schematic view of a second tab in a battery cell according to the first embodiment of the present application;

[0030] Fig. 7 is a schematic view of a second tab in a battery cell of a second embodiment of the present application.

[0031] Reference Signs:

[0032] Battery cell 10, main body 100, first face 110, second face 120, first portion 121, second portion 122, third face 130, first tab 200, first body portion 210, second body portion 220, second tab 300, first true tab 400, first conductive member 500, first false tab 510, intermediate face 600, first adhesive layer 700, second true tab 800, second conductive member 900, second false tab 910, second adhesive layer 1000. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar notations used throughout the drawings and the detailed description denote the same or similar elements or elements having the same or similar functions. The embodiments described below through reference to the accompanying drawings are exemplary, and are only for the purpose of explaining the present application, and cannot be understood as limiting the present application.

[0034] In the description of the present application, it is to be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0036] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0037] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] In the related art, after the pole piece is wound to form the battery cell 10, the battery cell 10 is charged and discharged by the tab. In order to improve the charging efficiency of the battery cell 10, the existing battery cell 10 is provided with a plurality of false tabs during manufacturing. Specifically, the battery cell 10 is provided with a true tab and a plurality of false tabs. The true tab is mainly responsible for circuit conduction with the outside world, and the plurality of false tabs are welded together. In this way, when the current from the outside world enters the battery cell 10 through the true tab, the current can pass through each layer of the pole piece through the plurality of false tabs, which can improve the charging efficiency. However, after the plurality of false tabs are provided, the energy density of the battery is low. Specifically, the plurality of false tabs protrude at one end of the battery cell 10, which indirectly increases the length of the battery cell body, resulting in that the battery cell 10 has a relatively long length, but the volume utilization rate is not high, and therefore the energy density of the battery is low. Therefore, the present application provides a battery cell 10.

[0039] Referring to FIGS. 1-7, in some embodiments, the battery cell 10 includes a main body 100, a first true tab 400, and a first conductive member 500. The main body 100 is formed by winding a stack of first and second electrode sheets 200, 300. The main body 100 includes opposite first and second faces 110, 120. Specifically, the first and second electrode sheets 200, 300 are stacked with a separator disposed therebetween to provide insulation. The first electrode sheet 200 can be a positive electrode sheet or a negative electrode sheet. Similarly, the second electrode sheet 300 can be a positive electrode sheet or a negative electrode sheet. The first true tab 400 is connected to the first electrode sheet 200 and protrudes relative to the first face 110. The battery cell 10 can be connected to an external current through the first true tab 400, i.e., the battery cell 10 is charged or discharged through the first true tab 400. The first true tab 400 can be a positive tab or a negative tab. The first conductive member 500 includes a plurality of first false tabs 510. The plurality of first false tabs 510 are connected to the first electrode sheet 200 and are stacked and welded along a thickness direction of the first conductive member 500. It is contemplated that after the first and second electrode sheets 200, 300 are wound to form the main body 100, the first electrode sheet 200 has a structure similar to a thousand-layer roll along a thickness direction of the main body 100. During charging, the current passes through the first true tab 400 and then enters each layer of the first electrode sheet 200. The plurality of first false tabs 510 welded together can shorten the path of the current, thereby improving the charging efficiency. Further, referring to FIGS. 1-4, an intermediate face 600 is defined to divide the second face 120 into a first portion 121 and a second portion 122 along a length direction of the main body 100. The first portion 121 can have an area equal to that of the second portion 122. In addition, the first and second portions 121, 122 can be symmetrically arranged. The first conductive member 500 is bent and connected to the first portion 121 and is attached to the second portion 122.

[0040] Specifically, referring to FIG. 3, the first conductive member 500 includes a plurality of first false tabs 510. After the plurality of first false tabs 510 are stacked and welded, the current can pass through the first conductive member 500 to reach various positions of the first electrode sheet 200, which can improve the charging efficiency of the battery cell 10. After the first conductive member 500 is bent and connected to the first portion 121 and is attached to the second portion 122, the first conductive member 500 does not occupy space in the length direction of the battery cell 10, which can effectively improve the energy density of the battery cell 10. Specifically, the battery cell 10 has a high energy density.

[0041] It should be noted that the first true lug 400 protrudes from the first face 110, and the first conductive piece 500 protrudes from the second face 120. In the manufacturing of the first tab 200, this can facilitate the work of the staff. If the first true lug 400 and the first conductive piece 500 are located at the same end of the main body 100, it will cause processing difficulties. In some special cases, the first conductive piece 500 and the first true lug 400 can also be arranged at the same end of the main body 100. Alternatively, the first conductive piece 500 can be provided with two, one at one end of the main body 100, and the other at the other end of the main body 100. In addition, the positions of the first conductive piece 500 and the first true lug 400 are not specifically limited, for example, the first conductive piece 500 can be located at the middle position of the main body 100, or at the edge position of the main body 100. Similarly, the first true lug 400 can be located at the middle position of the main body 100, or at the edge position of the main body 100, and the first true lug 400 can also be located at the middle position or the edge position of the first tab 200.

[0042] In order to prevent the first conductive piece 500 from increasing the length of the main body 100, the first conductive piece 500 can be bent and attached to the second part 122. Further, in order to effectively avoid the rebound of the first conductive piece 500, the first adhesive layer 700 can be provided. Specifically, referring to FIG. 3, in some embodiments, the battery cell 10 further comprises a first adhesive layer 700, and the first adhesive layer 700 is used to fix one end of the first conductive piece 500 to the main body 100. The first adhesive layer 700 can fix the end of the first conductive piece 500 that is not connected to the main body 100 to the main body 100, which can effectively avoid the rebound of the first conductive piece 500. The first adhesive layer 700 can be adhesive paper.

[0043] Further, how the first adhesive layer 700 fixes the first conductive piece 500 will be specifically introduced below. Referring to FIGS. 1-3, in some embodiments, the battery cell 10 further comprises two third faces 130, and the two ends of the second face 120 are respectively connected to one end of the two third faces 130, and the two ends of the first face 110 are respectively connected to the other end of the two third faces 130. The shape of the main body 100 is similar to a cuboid, or the shape of the main body 100 is a flat cylinder. The area of the third face 130 is greater than the area of the first face 110 and the second face 120. One end of the first adhesive layer 700 is attached to the first conductive piece 500, and the other end of the first adhesive layer 700 is attached to the third face 130. The first adhesive layer 700 connected to the third face 130 can have a better adhesive effect, so that the first adhesive layer 700 can fix the first conductive piece 500. In some other embodiments, one end of the first adhesive layer 700 can be attached to the first conductive piece 500, and the other end can be attached to the second part 122.

[0044] Further, the specific structure of the main body 100 is introduced as follows. Please refer to FIG. 1 to FIG. 5, in some embodiments, when the first tab 200 and the second tab 300 are stacked and flattened with each other, that is, when the main body 100 is flattened. The first tab 200 includes a plurality of first body portions 210 and a plurality of second body portions 220. The first tab 200 can refer to FIG. 5, and the second tab 300 can refer to FIG. 6. Along the length direction of the first tab 200, the first body portions 210 and the second body portions 220 are arranged alternately. The specific way of the first body portions 210 and the second body portions 220 arranged alternately is that, along the length direction of the first tab 200, the arrangement of the first body portions 210 and the second body portions 220 is: the first body portion 210, the second body portion 220, the first body portion 210, the second body portion 220, the first body portion 210, and the second body portion 220; or, along the length direction of the first tab 200, the arrangement of the first body portions 210 and the second body portions 220 is: the second body portion 220, the first body portion 210, the second body portion 220, the first body portion 210, and the second body portion 220. Each first body portion 210 is connected to a first dummy tab 510, and the first dummy tab 510 protrudes from the second body portion 220. Among them, after the first body portions 210 and the second body portions 220 are arranged alternately, and the first dummy tab 510 is connected to the first body portion 210, the first dummy tab 510 will be located in the first part 121 after the first tab 200 is wound into the main body 100, and will not be located in the second part 122. The second part 122 is not provided with the first dummy tab 510, which can reserve space for the first conductive member 500 and facilitate the bending of the first conductive member 500.

[0045] Further, in some embodiments, please refer to FIG. 5, the first real tab 400 and the first dummy tab 510 are connected to the same first body portion 210. In this way, when the battery cell 10 is charged, the current enters the first body portion 210 from the first real tab 400, and the first dummy tab 510 is arranged on the first body portion 210, so that the current can enter the first dummy tab 510 (the first conductive member 500) more quickly, thereby improving the charging efficiency of the battery cell 10.

[0046] Further, in some embodiments, the first false tab 510 and the first body part 210 are in an integrated structure. Specifically, the manufacturing process of the first false tab 510 and the first body part 210 in an integrated structure can be that, when the first tab 200 is manufactured, the first tab 200 is cut to cut a plurality of first false tabs 510 on the first tab 200, and two adjacent first false tabs 510 are spaced apart by a second body part 220. Then, the first tab 200 is wound to form the main body 100, which has the characteristic of convenient manufacturing. In other embodiments, the first false tab 510 can be welded on the first body part 210.

[0047] Further, in some embodiments, along the thickness direction of the main body 100, the size of the main body 100 is L1, and the size of the first conductive part 500 is L2, L2 < L1. The size of the first conductive part 500 refers to the length of the first conductive part 500 after being bent. Specifically, along the thickness direction of the main body 100, the size of the first conductive part 500 is smaller than the size of the main body 100, so that after being bent, the first conductive part 500 can effectively avoid exceeding the main body 100 in the thickness direction of the main body 100, thereby avoiding a low energy density of the battery cell 10.

[0048] Further, in order to improve the charging efficiency of the battery cell 10, a second conductive part 900 can also be provided on the second tab 300. Specifically, referring to FIGS. 1-2, in some embodiments, the battery cell 10 further includes a second true tab 800 and a second conductive part 900. The second true tab 800 is connected to the second tab 300 and protrudes relative to the first surface 110. The second tab 300 can be a positive tab or a negative tab. Similarly, the second tab 300 can be a positive tab or a negative tab. The battery cell 10 can be in electrical communication with the outside world through the second true tab 800, that is, the battery cell 10 realizes charging and discharging through the second true tab 800. The second true tab 800 can be a positive tab, and the second true tab 800 can be a negative tab. For example, the first true tab 400 can be a negative tab, and the second true tab 800 can be a positive tab. The second conductive part 900 includes a plurality of second false tabs 910, the plurality of second false tabs 910 are connected to the second tab 300, and the plurality of second false tabs 910 are stacked and welded in the thickness direction. The second tab 300 in the flattened state can refer to FIG. 7, and the second conductive part 900 is bent and connected to the first part 121, and the second conductive part 900 is attached to the second part 122. The second conductive part 900 includes a plurality of second false tabs 910, and after the plurality of second false tabs 910 are stacked and welded, the current can enter the second tab 300 at various positions through the second conductive part 900, which can improve the charging efficiency of the battery cell 10. Specifically, under the cooperation of the first conductive part 500 and the second conductive part 900, the charging efficiency of the battery cell 10 is high.

[0049] Further, in order to effectively avoid the rebound of the second conductive member 900, the second adhesive layer 1000 can be provided. Specifically, referring to FIG. 2, in some embodiments, the battery cell 10 further includes a second adhesive layer 1000, and the second adhesive layer 1000 is configured to fix one end of the second conductive member 900 to the main body 100. The second adhesive layer 1000 can fix the end of the second conductive member 900 that is not connected to the main body 100 to the main body 100, which can effectively avoid the rebound of the second conductive member 900. The second adhesive layer 1000 can be adhesive paper.

[0050] Further, how the second adhesive layer 1000 fixes the second conductive member 900 will be described in detail below. Referring to FIG. 2, in some embodiments, the battery cell 10 further includes two third surfaces 130, and two ends of the second surface 120 are respectively connected to one end of the two third surfaces 130, and two ends of the first surface 110 are respectively connected to the other end of the two third surfaces 130. The main body 100 has a shape similar to a cuboid, or the main body 100 has a shape of a flat cylinder. The area of the third surface 130 is greater than the area of the first surface 110 and the second surface 120. One end of the second adhesive layer 1000 is attached to the second conductive member 900, and the other end of the second adhesive layer 1000 is attached to the third surface 130. The second adhesive layer 1000 connected to the third surface 130 can have a better adhesion effect, so that the second adhesive layer 1000 can fix the second conductive member 900.

[0051] In some embodiments, the battery includes the battery cell 10 of any one of the above embodiments. The first conductive member 500 includes a plurality of first dummy tabs 510, and after the plurality of first dummy tabs 510 are laminated and welded, the current can pass through the first conductive member 500 to each position of the first tab 200, which can improve the charging efficiency of the battery cell 10. Specifically, the first conductive member 500 is connected to the first portion 121 by being bent, and the first conductive member 500 is attached to the second portion 122, so that the first conductive member 500 does not occupy the space of the battery cell 10 in the length direction, which can effectively improve the energy density of the battery cell 10. Specifically, the battery cell 10 has a high energy density. Further, the battery has a high energy density.

[0052] In some embodiments, the electronic device includes the battery in the above embodiments. The first conductive piece 500 includes a plurality of first false tabs 510. After the plurality of first false tabs 510 are stacked and welded, current can pass through the first conductive piece 500 to each position of the first tab 200, which can improve the charging efficiency of the battery cell 10. Specifically, the battery cell 10 has a higher energy density. Further, the battery also has a higher energy density.

[0053] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above embodiments. Within the scope of knowledge of those skilled in the art, various changes can be made to the embodiments of the present application without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. An electric core, comprising: a main body formed by laminating and winding a first tab and a second tab, the main body comprising a first face and a second face opposite to each other; a first real tab connected to the first tab and protruding relative to the first face; a first conductive member comprising a plurality of first false tabs, each of the plurality of first false tabs being connected to the first tab, the plurality of first false tabs being laminated and welded along a thickness direction to define a middle face, the middle face dividing the second face into a first part and a second part along a length direction of the main body, the first conductive member being bent and connected to the first part, and the first conductive member being attached to the second part.

2. The electric cell of claim 1, wherein, The electric core further comprises a first adhesive layer for fixing one end of the first conductive member on the main body.

3. The electric cell of claim 2, wherein, The electric core further comprises two third faces, two ends of the second face being connected to one end of the two third faces respectively, two ends of the first face being connected to the other end of the two third faces respectively, one end of the first adhesive layer being attached to the first conductive member, and the other end of the first adhesive layer being attached to the third face.

4. The electric cell of claim 1, wherein, When the first tab and the second tab are laminated and flattened, the first tab comprises a plurality of first body portions and a plurality of second body portions, the first body portions and the second body portions being arranged alternately along a length direction of the first tab, each of the first body portions being connected to one of the first false tabs, the first false tab protruding from the second body portion.

5. The electric cell of claim 4, wherein, The first false tab and the first body portion are in an integrated structure.

6. The electric cell of claim 1, wherein, Along the thickness direction of the main body, a size of the main body is L1, and a size of the first conductive member is L2, L2 < L1.

7. The electric cell of claim 1, wherein, The electric core further comprises a second real tab and a second conductive member, the second real tab being connected to the second tab and protruding relative to the first face, the second conductive member comprising a plurality of second false tabs, each of the plurality of second false tabs being connected to the second tab, the plurality of second false tabs being laminated and welded along a thickness direction, the second conductive member being bent and connected to the first part, and the second conductive member being attached to the second part.

8. The electric cell of claim 7, wherein, The electric core further comprises a second adhesive layer for fixing one end of the second conductive member on the main body.

9. A battery comprising the electric core according to any one of claims 1 to 8.

10. An electronic device comprising the battery according to claim 9.

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