Battery cell, battery and electronic device

Abstract

Disclosed in the present application are a battery cell, a battery, and an electronic device. The battery cell comprises: a main body comprising a positive electrode sheet and a negative electrode sheet, wherein the main body is formed by means of stacking the positive electrode sheet and the negative electrode sheet and then winding same; a first positive tab electrically connected to the positive electrode sheet; a second positive tab electrically connected to the positive electrode sheet; and a negative tab electrically connected to the negative electrode sheet, wherein the first positive tab and the negative tab are respectively located on two sides of the second positive tab in the direction of width. The battery cell of the present application can be quickly charged.

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, the battery cell includes a positive electrode sheet, a negative electrode sheet and a separator. The positive electrode sheet is usually made of an active material (such as lithium cobaltate, nickel cobalt manganese ternary material or iron lithium phosphate) with high energy density coated on a conductive current collector (such as aluminum foil), which is responsible for storing lithium ions during charging and releasing these ions to generate electric energy during discharging. The negative electrode sheet is usually made of graphite or silicon-carbon composite material as an active material, which is also coated on a copper foil or other current collector. When charged, the negative electrode sheet receives lithium ions migrated from the positive electrode, and when discharged, the negative electrode sheet releases lithium ions back to the positive electrode, completing the conversion between electric energy and chemical energy. The separator mainly plays the role of allowing ions in the electrolyte to freely shuttle to maintain the smoothness of the circuit and prevent the short circuit of the positive electrode sheet and the negative electrode sheet. Among them, the battery cell needs to be charged after being used for a period of time, but the existing battery cell has the problem of slow charging. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a battery cell capable of fast charging.

[0004] The present application also provides a battery.

[0005] The present application also provides an electronic device.

[0006] According to the first aspect of the present application, the battery cell comprises:

[0007] a main body comprising a positive electrode sheet and a negative electrode sheet, the main body being formed by winding the positive electrode sheet and the negative electrode sheet after being stacked;

[0008] a first positive electrode tab electrically connected to the positive electrode sheet;

[0009] a second positive electrode tab electrically connected to the positive electrode sheet;

[0010] a negative electrode tab electrically connected to the negative electrode sheet;

[0011] wherein the first positive electrode tab and the negative electrode tab are respectively located on both sides of the second positive electrode tab in the width direction.

[0012] According to the battery cell provided by the embodiment of the present application, the following beneficial effects are achieved: when the battery cell is charging, the current from the outside enters the battery cell through the first positive tab and the second positive tab. In the prior art, the battery cell has only one positive tab, and thus the current enters the battery cell slowly. In the present application, the current enters the battery cell through the first positive tab and the second positive tab, and thus the charging speed of the battery cell is increased. Specifically, the battery cell can be quickly charged.

[0013] According to the battery cell provided by some embodiments of the present application, the first positive tab and the second positive tab are located at different winding layers of the main body.

[0014] According to the battery cell provided by some embodiments of the present application, the positive tab includes a first segment, a second segment and a third segment, the two ends of the second segment are connected to the first segment and the third segment respectively, the second segment is provided with a positive active material layer, the first segment and the third segment are not provided with the positive active material layer, the first segment is the winding starting point of the positive tab, the third segment is the winding ending point of the positive tab, the second positive tab is connected to the first segment, and the first positive tab is connected to the third segment.

[0015] According to the battery cell provided by some embodiments of the present application, the negative tab is provided with the negative active material layer on both sides, a groove is arranged at the middle position of the negative active material layer, and the negative tab is arranged in the groove.

[0016] According to the battery cell provided by some embodiments of the present application, the battery cell further includes two positive tab rubbers, and the two positive tab rubbers are attached to the first positive tab and the second positive tab respectively.

[0017] According to the battery cell provided by some embodiments of the present application, the shoulder width of the positive tab rubber in the width direction of the main body is M, and 2mm≤M≤3mm.

[0018] According to the battery cell provided by some embodiments of the present application, the distance between the first positive tab and the second positive tab in the width direction of the main body is L1, and L1≥2M.

[0019] According to the battery cell provided by some embodiments of the present application, the distance between the first positive tab and the negative tab in the width direction of the main body is L2, and L2-L1≥2M.

[0020] According to the battery cell provided by some embodiments of the present application, the main body includes a flat portion and two curved portions, the two curved portions are connected to the two ends of the flat portion respectively, and the first positive tab, the second positive tab and the negative tab are located at the flat portion.

[0021] The battery according to some embodiments of the present application further comprises a separator, which is located between the positive electrode sheet and the negative electrode sheet.

[0022] The battery according to the second aspect of the embodiments of the present application comprises:

[0023] The shell has a storage cavity.

[0024] The battery according to any one of the first aspect of the embodiments of the present application is arranged in the storage cavity.

[0025] The battery according to the embodiments of the present application has at least the following beneficial effects: when the battery is charging, the current from the outside enters the battery from the positive electrode. Specifically, after the battery is provided with the first positive electrode tab and the second positive electrode tab, the current from the outside can enter the battery from the first positive electrode tab and the second positive electrode tab. In the prior art, the battery has only one positive electrode tab, so the speed of the current entering the battery is slow. In the present application, the current can enter the battery from the first positive electrode tab and the second positive electrode tab, so this can make the charging speed of the battery faster. Specifically, the battery can be quickly charged. Further, the battery with the battery has a faster charging speed.

[0026] The electronic device according to the third aspect of the embodiments of the present application comprises the battery according to the second aspect of the embodiments of the present application.

[0027] The electronic device according to the embodiments of the present application has at least the following beneficial effects: when the battery is charging, the current from the outside enters the battery from the positive electrode. Specifically, after the battery is provided with the first positive electrode tab and the second positive electrode tab, the current from the outside can enter the battery from the first positive electrode tab and the second positive electrode tab. In the prior art, the battery has only one positive electrode tab, so the speed of the current entering the battery is slow. In the present application, the current can enter the battery from the first positive electrode tab and the second positive electrode tab, so this can make the charging speed of the battery faster. Specifically, the battery can be quickly charged. Further, the battery with the battery has a faster charging speed. Still further, the electronic device with the battery can be conveniently used.

[0028] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0029] The present application will be further described below in conjunction with the drawings and embodiments, in which:

[0030] FIG. 1 is a schematic view of the battery according to the first embodiment of the present application;

[0031] FIG. 2 is a schematic view of the battery according to the second embodiment of the present application;

[0032] FIG. 3 is a schematic view of an electric core of a third embodiment of the present application.

[0033] Reference signs: electric core 10, main body 100, flat portion 110, curved portion 120, positive electrode sheet 200, first section 210, second section 220, third section 230, negative electrode sheet 300, separator 400, first positive electrode tab 500, second positive electrode tab 600, negative electrode tab 700, positive electrode tab adhesive 800, negative electrode tab adhesive 900. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar notations are used to designate the same or similar elements throughout the drawings. 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 construed as limiting the present application.

[0035] In the description of the present application, it is to be understood that, in relation to the orientation description, the orientation or position relationship indicated by, for example, 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 therefore cannot be construed as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0036] 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, within, 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 construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0037] 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.

[0038] 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.

[0039] In the related art, the battery cell 10 includes a positive electrode sheet 200, a negative electrode sheet 300, and a separator 400. The positive electrode sheet 200 is usually made of an active material (such as lithium cobaltate, nickel cobalt manganese ternary material, or iron lithium phosphate) with high energy density coated on a conductive current collector (such as an aluminum foil), which is responsible for storing lithium ions during charging and releasing these ions to generate electric energy during discharging. The negative electrode sheet 300 usually uses graphite or silicon-carbon composite material as the active material, which is also coated on a copper foil or other current collector. During charging, the negative electrode sheet 300 receives lithium ions migrated from the positive electrode, and releases them back to the positive electrode during discharging, completing the conversion between electric energy and chemical energy. The separator 400 mainly plays the role of allowing ions in the electrolyte to shuttle freely to maintain the smoothness of the circuit, and preventing the positive electrode sheet 200 and the negative electrode sheet 300 from short-circuiting. Among them, the battery cell 10 needs to be charged after being used for a period of time, but the existing battery cell 10 has the problem of slow charging. Therefore, the present application proposes a battery cell 10.

[0040] Referring to FIGS. 1-3, in some embodiments, the battery cell 10 includes a main body 100, a first positive tab 500, a second positive tab 600, and a negative tab 700. The main body 100 includes a positive sheet 200 and a negative sheet 300, and the main body 100 is formed by winding the positive sheet 200 and the negative sheet 300 after they are stacked. Specifically, the positive sheet 200 is usually made of an active material with high energy density, such as lithium cobalt oxide, nickel cobalt manganese ternary material, or lithium iron phosphate, coated on a conductive current collector, such as an aluminum foil. The negative sheet 300 is usually made of graphite or silicon-carbon composite material as an active material, coated on a copper foil current collector. After the positive sheet 200 and the negative sheet 300 are stacked in the thickness direction of the positive sheet 200, the same end of the positive sheet 200 and the negative sheet 300 is wound to form the main body 100. The tabs include the positive tabs and the negative tab 700. During charging, an external power source inputs electrical energy to the inside of the battery cell 10 through the positive tabs, causing lithium ions to be released from the positive material and migrate to the negative electrode through the electrolyte; during discharging, lithium ions are released from the negative material, return to the positive electrode through the electrolyte, and release electrical energy, which also needs to be transmitted to the external circuit through the positive tabs. In the application, the positive tabs include the first positive tab 500 and the second positive tab 600. The first positive tab 500 is electrically connected to the positive sheet 200, and the second positive tab 600 is electrically connected to the positive sheet 200. The number of the first positive tab 500 and the second positive tab 600 is not specifically limited, for example, the number of the first positive tab 500 can be one, two, or more, and the number of the second positive tab 600 can be one, two, or more. The first positive tab 500 can be electrically connected to the positive sheet 200 by being welded to the positive sheet 200. The second positive tab 600 can be electrically connected to the positive sheet 200 by being welded to the positive sheet 200. The negative tab 700 is electrically connected to the negative sheet 300, and the number of the negative tab 700 can be one. The negative tab 700 can be electrically connected to the negative sheet 300 by being welded to the negative sheet 300. The first positive tab 500 and the negative tab 700 are located on both sides of the second positive tab 600 in the width direction of the second positive tab 600. Specifically, when the battery cell 10 is charging, the current from the outside enters the battery cell 10 from the positive tab. Specifically, after the battery cell 10 is provided with the first positive tab 500 and the second positive tab 600, the current from the outside can enter the battery cell 10 from the first positive tab 500 and the second positive tab 600. In the prior art, the battery cell 10 has only one positive tab, so the current enters the battery cell 10 slowly. In the present application, the current can enter the battery cell 10 from the first positive tab 500 and the second positive tab 600, so the charging speed of the battery cell 10 can be faster. Specifically, the battery cell 10 can be quickly charged.

[0041] It is to be continued that after the first positive lug 500 and the second positive lug 600 are arranged, the first positive lug 500 and the second positive lug 600 can also play a role of common shunt during the charging process of the battery cell 10, so as to avoid the temperature of the battery cell 10 being too high. In addition, the arrangement of the first positive lug 500 and the second positive lug 600 can also reduce the internal resistance of the battery cell 10. It is to be further supplemented that the first positive lug 500 and the negative lug 700 are respectively located on both sides of the width direction of the second positive lug 600, and compared with the arrangement that the first positive lug 500 and the second positive lug 600 are respectively located on both sides of the negative lug 700, the former has higher safety and is more likely to effectively avoid the risk of short circuit of the battery cell 10.

[0042] Further, please refer to FIGS. 1-3, in some embodiments, the first positive lug 500 and the second positive lug 600 are respectively located on different winding layers of the main body 100. Specifically, as mentioned above, the main body 100 includes the positive sheet 200 and the negative sheet 300, and after the positive sheet 200 and the negative sheet 300 are stacked, the main body 100 is formed by winding. Therefore, the positive sheet 200 on the main body 100 has multiple layers of winding, the first positive lug 500 can be located on the outermost positive sheet 200, or the first positive lug 500 can be located on the middle layer of the positive sheet 200, or the first positive lug 500 can be located on the innermost positive sheet 200. The second positive lug 600 can be located on the outermost positive sheet 200, or the second positive lug 600 can be located on the middle layer of the positive sheet 200, or the second positive lug 600 can be located on the innermost positive sheet 200. Wherein, after the first positive lug 500 and the second positive lug 600 are respectively located on different winding layers of the main body 100, when the battery cell 10 is charged, the first positive lug 500 and the second positive lug 600 can respectively diffuse the current to different layers of the positive sheet 200, which can improve the charging speed compared with the arrangement that the first positive lug 500 and the second positive lug 600 are located on the same winding layer of the main body 100, and the first positive lug 500 and the second positive lug 600 respectively located on different winding layers of the main body 100 can improve the charging speed and make the charging speed of the battery cell 10 faster.

[0043] Further, the specific manners that the first positive tab 500 and the second positive tab 600 are located at different winding layers of the main body 100 are introduced as follows. Please refer to FIGS. 1 to 3. In some embodiments, the positive sheet 200 includes a first section 210, a second section 220 and a third section 230. The second section 220 is connected to the first section 210 and the third section 230 respectively, the second section 220 is provided with a positive active material layer, and the first section 210 and the third section 230 are not provided with the positive active material layer. The first section 210 is the winding starting point of the positive sheet 200, the third section 230 is the winding ending point of the positive sheet 200, the second positive tab 600 is connected to the first section 210, and the first positive tab 500 is connected to the third section 230. Specifically, for the convenience of understanding, the positive sheet 200 can be in a flat state, and after the second positive tab 600 is connected to the first section 210 and the first positive tab 500 is connected to the third section 230 in the flat state of the positive sheet 200, the first positive tab 500 and the second positive tab 600 are located at two ends of the positive sheet 200 respectively. When charging the positive sheet 200, the current from the outside can enter the positive sheet 200 from the first positive tab 500 and the second positive tab 600 respectively, that is, the current from the outside enters each position of the positive sheet 200 from both ends of the positive sheet 200, which can greatly improve the charging speed. In addition, it should be noted that when the first positive tab 500 is arranged at the middle position of the positive sheet 200, the charging effect of the present embodiment can also be achieved, that is, the current from the outside enters each position of the positive sheet 200 from the middle position of the positive sheet 200. In some other embodiments, the projection of the first positive tab 500 along the thickness direction of the main body 100 can overlap the projection of the second positive tab 600 completely.

[0044] Further, in some embodiments, the negative tab 700 is connected to the middle position of the negative sheet 300. That is, both sides of the negative sheet 300 are provided with a negative active material layer, and the middle position of the negative active material layer is provided with a groove, and the negative tab 700 is arranged in the groove. Specifically, after the negative tab 700 is arranged at the middle position of the negative sheet 300, when charging the negative sheet 300, the current can spread from the middle position of the negative sheet 300 to each position of the negative sheet 300, which greatly improves the charging speed of the negative sheet 300.

[0045] Further, referring to FIG. 1, in some embodiments, the battery cell 10 further comprises two positive tab rubbers 800, which are respectively attached to the first positive tab 500 and the second positive tab 600. The main function of the positive tab rubber 800 is insulation, which prevents the tab from directly contacting other parts of the battery (such as the aluminum plastic film) to cause short circuit. During the battery packaging process, the positive tab rubber 800 is bonded together with the aluminum plastic film by heating and hot melting sealing, forming an effective insulation barrier to ensure the safe operation of the battery. In this way, after the two positive tab rubbers 800 are respectively attached to the first positive tab 500 and the second positive tab 600, the safety of the battery can be improved. The battery cell 10 further comprises a negative tab rubber 900, which is attached to the negative tab 700.

[0046] Further, referring to FIG. 1, in some embodiments, the shoulder width of the positive tab rubber 800 in the width direction of the main body 100 is M, and 2mm≤M≤3mm. The shoulder width of the positive tab rubber 800 refers to the part of the positive tab rubber 800 that protrudes relative to the tab. The shoulder width of the positive tab rubber 800 in the width direction of the main body 100 can be 2mm, 2.5mm or 3mm. When the shoulder width of the positive tab rubber 800 in the width direction of the main body 100 is less than 2mm, due to the small size of the positive tab rubber 800, it may cause poor insulation of the positive tab rubber 800. When the shoulder width of the positive tab rubber 800 in the width direction of the main body 100 is greater than 3mm, under the premise that the positive tab rubber 800 meets the insulation performance, the excessive size will cause waste of materials.

[0047] Further, referring to FIGS. 1-3, in some embodiments, the distance between the first positive tab 500 and the second positive tab 600 in the width direction of the main body 100 is L1, and L1≥7mm, L1≥2M. The distance between the first positive tab 500 and the second positive tab 600 in the width direction of the main body 100 can be 7mm, 8mm or 9mm, etc. When the distance between the first positive tab 500 and the second positive tab 600 is relatively close, it may cause the first positive tab 500 and the second positive tab 600 to overlap in the thickness direction of the main body 100, which will increase the thickness of the battery cell 10, thereby reducing the energy density of the battery cell 10. In addition, when L1 is not less than 2M, the packaging effect of the battery cell 10 can be better, and the reliability of the battery cell 10 can be improved.

[0048] Further, please refer to FIGS. 1-3, in some embodiments, the distance between the first positive tab 500 and the negative tab 700 along the width direction of the main body 100 is L2, and L2-L1≥2M. When the distance between the second positive tab 600 and the negative tab 700 is relatively short, it can cause the second positive tab 600 and the negative tab 700 to contact, thereby causing the battery cell 10 to short circuit. When L2-L1≥2M is satisfied, the packaging effect of the battery cell 10 is good, and the reliability is high. For details, please refer to Table 1.

[0049] Table 1

[0050] The test method is to fill the inside of the top sealing edge of the battery cell 10 with a liquid drop, clean it after standing for 10 minutes, and tear open the sol to observe whether there is a red trace channel. From the above table, it can be seen that when L2-L1≥2M is satisfied, the packaging effect of the battery cell 10 is good, and the pass rate is 100%, and when L2-L1≥2M is not satisfied, the packaging pass rate of the battery cell 10 is low.

[0051] Further, please refer to FIGS. 1-3, in some embodiments, the main body 100 includes a flat portion 110 and two curved portions 120, and the two curved portions 120 are respectively connected to the two ends of the flat portion 110. The first positive tab 500, the second positive tab 600, and the negative tab 700 are all located on the flat portion 110. Specifically, after the positive sheet 200 and the negative sheet 300 are wound to form the main body 100, the main body 100 includes the flat portion 110 and the two curved portions 120. Among them, the curved portion 120 is bent. If the first positive tab 500, the second positive tab 600, and the negative tab 700 are arranged on the curved portion 120, there will be a problem of difficult welding, because the positive sheet 200 and the negative sheet 300 at the curved portion 120 are bent, and the first positive tab 500, the second positive tab 600, and the negative tab 700 are all located on the flat portion 110, which can facilitate welding and improve processing efficiency.

[0052] Further, please refer to FIG. 1 to FIG. 3, in some embodiments, the battery cell 10 further comprises a separator 400, which is located between the positive electrode sheet 200 and the negative electrode sheet 300. Specifically, the main role of the separator 400 is to prevent the positive electrode sheet 200 and the negative electrode sheet 300 from directly contacting, so as to avoid internal short circuit of the battery cell 10. At the same time, the separator 400 can also allow the electrolyte ions (such as lithium ions) to pass freely during the charging and discharging process, so as to complete the storage and release of electric energy. The separator 400 has good insulation, ion permeability and certain mechanical strength. Specifically, the separator 400 is usually made of microporous material, such as polyethylene (PE), polypropylene (PP) or their composite materials. These materials have good insulation performance, which can effectively prevent the positive and negative electrodes of the battery from directly contacting. At the same time, their microporous structure allows the electrolyte ions to pass during the charging and discharging process, ensuring the normal work of the battery.

[0053] In some embodiments, the battery comprises: a housing and the battery cell 10 in the above embodiments. The housing has a storage cavity. The housing can be an aluminum plastic film or a metal shell, such as a steel shell or an aluminum shell. The battery cell 10 is arranged in the storage cavity. Specifically, when the battery cell 10 is charged, the current from the outside enters the battery cell 10 from the positive electrode. Specifically, after the battery cell 10 is provided with the first positive electrode tab 500 and the second positive electrode tab 600, the current from the outside can enter the battery cell 10 from the first positive electrode tab 500 and the second positive electrode tab 600. In the prior art, the battery cell 10 has only one positive electrode tab, so the speed of the current entering the battery cell 10 is slow. However, in the present application, the current can enter the battery cell 10 from the first positive electrode tab 500 and the second positive electrode tab 600, so this can make the charging speed of the battery cell 10 faster. Specifically, the battery cell 10 can be quickly charged. Further, the charging speed of the battery with the battery cell 10 is also faster.

[0054] In some embodiments, the electronic device comprises the battery in the above embodiments. Specifically, when the battery cell 10 is charged, the current from the outside enters the battery cell 10 from the positive electrode. Specifically, after the battery cell 10 is provided with the first positive electrode tab 500 and the second positive electrode tab 600, the current from the outside can enter the battery cell 10 from the first positive electrode tab 500 and the second positive electrode tab 600. In the prior art, the battery cell 10 has only one positive electrode tab, so the speed of the current entering the battery cell 10 is slow. However, in the present application, the current can enter the battery cell 10 from the first positive electrode tab 500 and the second positive electrode tab 600, so this can make the charging speed of the battery cell 10 faster. Specifically, the battery cell 10 can be quickly charged. Further, the charging speed of the battery with the battery cell 10 is also faster. Still further, the electronic device with the battery can be conveniently used.

[0055] 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, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit 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 cell, comprising: a main body comprising a positive electrode sheet and a negative electrode sheet, the main body being formed by winding after layering the positive electrode sheet and the negative electrode sheet; a first positive electrode tab electrically connected to the positive electrode sheet; a second positive electrode tab electrically connected to the positive electrode sheet; a negative electrode tab electrically connected to the negative electrode sheet; wherein the first positive electrode tab and the negative electrode tab are respectively located on both sides of the second positive electrode tab in a width direction.

2. The electric cell of claim 1, wherein, The first positive electrode tab and the second positive electrode tab are respectively located in different winding layers of the main body.

3. The electric cell of claim 2, wherein, The positive electrode sheet comprises a first section, a second section and a third section, both ends of the second section are respectively connected to the first section and the third section, the second section is provided with a positive electrode active material layer, neither the first section nor the third section is provided with a positive electrode active material layer, the first section is a winding starting point of the positive electrode sheet, the third section is a winding ending point of the positive electrode sheet, the second positive electrode tab is connected to the first section, and the first positive electrode tab is connected to the third section.

4. The electric cell of claim 1, wherein, Both sides of the negative electrode sheet are provided with a negative electrode active material layer, a groove is arranged at a middle position of the negative electrode active material layer, and the negative electrode tab is arranged in the groove.

5. The electric cell of claim 1, wherein, The electric cell further comprises two positive electrode tab adhesives, and the two positive electrode tab adhesives are respectively attached to the first positive electrode tab and the second positive electrode tab.

6. The electric cell of claim 5, wherein, A shoulder width of the positive electrode tab adhesive in the width direction of the main body is M, and 2mm≤M≤3mm.

7. The electric cell of claim 6, wherein, In the width direction of the main body, a distance between the first positive electrode tab and the second positive electrode tab is L1, and L1≥2M.

8. The electric cell of claim 7, wherein, In the width direction of the main body, a distance between the first positive electrode tab and the negative electrode tab is L2, and L2-L1≥2M.

9. The electric cell of claim 1, wherein, The main body comprises a flat portion and two curved portions, the two curved portions are respectively connected to both ends of the flat portion, and the first positive electrode tab, the second positive electrode tab and the negative electrode tab are all located in the flat portion.

10. The electric cell of claim 1, wherein, The electric cell further comprises a separator, and the separator is located between the positive electrode sheet and the negative electrode sheet. 11.A battery, comprising: a shell having a storage cavity; the electric cell according to any one of claims 1 to 10, arranged in the storage cavity. 12.An electronic device comprising the battery according to claim 11.

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