Battery cell, battery and electric equipment

Abstract

The utility model discloses a battery cell, a battery and electric equipment. The battery cell comprises a stacked core and an insulating adhesive tape, the stacked core is formed by stacking a plurality of pole pieces, one end of the stacked core extends to form a positive tab and a negative tab, and the positive tab and the negative tab are spaced; the adhesive tape is located between the positive tab and the negative tab and at least wraps the end face of the stacked core in the stacking direction of the multiple pole pieces, the positive tab, the adhesive tape and the negative tab are arranged at intervals in the width direction of the stacked core, in the width direction of the stacked core, the minimum distance between the adhesive tape and the positive tab is L1, the minimum distance between the adhesive tape and the negative tab is L2, and L1 is larger than or equal to 2mm and smaller than or equal to 5mm. L2 is greater than or equal to 2mm and less than or equal to 5mm. According to the battery cell provided by the invention, the adhesive tape can be ensured not to interfere with the positive tab and the negative tab, and the electrolyte can be prevented from directly impacting the pole piece in the electrolyte injection process, so that the safety risk of the battery is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] In the related art, the battery core includes positive and negative electrodes, and the end faces of the core are fixed with tape, but the tape easily interferes with the tabs extending from the core. At the same time, when the electrolyte is injected into the battery, the electrolyte impacts the electrode, causing the electrode to fall off and causing abnormal self-discharge of the battery, which leads to poor battery safety and short service life. Utility Model Content

[0003] The present application aims to solve the above technical problems in the prior art at least to a certain extent. To this end, the present application proposes a battery cell that is conducive to improving the safety and durability of the battery.

[0004] The present application also proposes a battery having the above-mentioned battery cell.

[0005] The present application also proposes an electrical device having the battery.

[0006] According to an embodiment of the present application, the battery cell includes: a stacked core and an insulating tape, wherein the stacked core is formed by stacking a plurality of electrode sheets, and one end of the stacked core extends to form a positive electrode ear and a negative electrode ear, and the positive electrode ear is spaced apart from the negative electrode ear; the tape is located between the positive electrode ear and the negative electrode ear, and the tape covers the end surface of the stacked core at least in the stacking direction of the plurality of electrode sheets, and the positive electrode ear, the tape and the negative electrode ear are spaced apart in the width direction of the stacked core. In the width direction of the stacked core, the minimum distance between the tape and the positive electrode ear is L1, and the minimum distance between the tape and the negative electrode ear is L2, satisfying the following: 2mm≤L1≤5mm, 2mm≤L2≤5mm.

[0007] According to the battery cell of the embodiment of the present application, by setting the minimum distance between the tape and the positive electrode ear to 2mm~5mm, and the minimum distance between the tape and the negative electrode ear to 2mm~5mm, it can not only ensure that the tape will not interfere with the positive electrode ear and the negative electrode ear, but also avoid the electrolyte from directly impacting the electrode during the injection process, prevent the battery self-discharge abnormality caused by the electrode falling off, and improve the safety and life of the battery.

[0008] According to some embodiments of the present application, a code engraving area is provided on the adhesive tape.

[0009] According to some embodiments of the present application, the thickness of the tape is 25um to 35um.

[0010] According to some embodiments of the present application, the stacked core has a large surface, the adhesive tape extends from the end surface of the stacked core to the large surface, and the extension length of the adhesive tape on the large surface is 15 mm to 35 mm.

[0011] According to some embodiments of the present application, the multiple electrode sheets include positive electrode sheets and negative electrode sheets, the positive electrode sheet includes a positive electrode sheet body, the positive electrode ear is connected to the positive electrode sheet body, and the positive electrode ear extends outward relative to the positive electrode sheet body; the negative electrode sheet includes a negative electrode sheet body, the negative electrode ear is connected to the negative electrode sheet body, and the extension direction of the negative electrode ear relative to the negative electrode sheet body is the same as the extension direction of the positive electrode ear, and the tape extends on the large surface in the opposite direction of the extension of the negative electrode ear.

[0012] According to some embodiments of the present application, the positive electrode sheet body and the negative electrode sheet body are stacked, and the positive electrode sheet body and the negative electrode sheet body have electrode thinning areas at the protruding ends of the corresponding electrode ears, and the extension length of the tape on the large surface is greater than the length of the electrode thinning area in the same direction.

[0013] According to some embodiments of the present application, the tape includes a first section and a second section, the first section and the second section are connected, the stacked core has a first large surface, a second large surface, a first end surface and a second end surface, the first large surface and the second large surface face away from each other, the first end surface and the second end surface face away from each other, the positive electrode ear and the negative electrode ear both extend from the first end surface, the first section is attached to the first large surface, and the second section is attached to the first end surface.

[0014] According to some embodiments of the present application, the adhesive tape further includes a third section, the second section connects the first section and the third section, and the third section is attached to the second large surface.

[0015] According to another embodiment of the present application, a battery includes a shell and the above-mentioned battery cell, wherein the shell is provided with a liquid injection hole, and the projection of the liquid injection hole on the battery cell is located on the tape.

[0016] According to the battery of the embodiment of the present application, the battery cell sets the minimum distance between the tape and the positive electrode ear to 2mm~5mm, and the minimum distance between the tape and the negative electrode ear to 2mm~5mm, which can not only ensure that the tape does not interfere with the positive and negative electrode ears, but also avoid the electrolyte from directly impacting the electrode during the injection process, prevent the battery self-discharge abnormality caused by the electrode falling off, and improve the safety and life of the battery.

[0017] According to another embodiment of the present application, an electric device includes the above-mentioned battery.

[0018] According to the electrical equipment of the embodiment of the present application, the battery cell sets the minimum distance between the tape and the positive electrode ear to 2mm~5mm, and the minimum distance between the tape and the negative electrode ear to 2mm~5mm, which can not only ensure that the tape does not interfere with the positive and negative electrode ears, but also avoid the electrolyte from directly impacting the electrode during the injection process, prevent the battery self-discharge abnormality caused by the electrode falling off, and thus improve the safety and life of the battery.

[0019] 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

[0020] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present application;

[0021] Figure 2 yes Figure 1 Schematic diagram of the middle A direction;

[0022] Figure 3 yes Figure 1 Schematic diagram of the middle B direction;

[0023] Figure 4 is a side view of an adhesive tape according to one embodiment of the present application;

[0024] Figure 5 is a side view of an adhesive tape according to another embodiment of the present application;

[0025] Figure 6 It is a top view of the positive electrode;

[0026] Figure 7 It is a top view of the negative electrode sheet;

[0027] Figure 8 It is a schematic diagram of the stacked core;

[0028] Figure 9 Schematic diagram of a separator separating a positive electrode sheet and a negative electrode sheet according to an embodiment of the present application;

[0029] Figure 10 is a schematic diagram of a separator separating a positive electrode sheet and a negative electrode sheet according to another embodiment of the present application;

[0030] Figure 11 It is a schematic diagram of an electrical device according to an embodiment of the present application.

[0031] Reference numerals:

[0032] Battery 100, battery cell 10, electrode 1, positive electrode 11, positive electrode body 111, positive electrode ear 112, negative electrode 12, negative electrode body 121, negative electrode ear 122, electrode thinning area 13, tape 2, first section 21, second section 22, third section 23, coding area 24, stacked core 3, first large surface 31, second large surface 32, first end surface 33, second end surface 34, diaphragm 4, shell 20, injection hole 201. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present application, examples of which 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 intended to be used to explain the present application, and should not be construed as limiting the present application.

[0034] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] The following combination Figures 1-11 The battery cell 10 , the battery 100 , and the electrical device according to the embodiments of the present application are described in detail.

[0036] Reference Figures 1-2 、 Figures 6-11 As shown, in some embodiments, the battery cell 10 includes a stacked core 3 and a tape 2. The stacked core 3 is formed by stacking multiple electrode sheets 1. One end of the stacked core 3 extends to form a positive electrode tab 112 and a negative electrode tab 122. The positive electrode tab 112 is spaced apart from the negative electrode tab 122.

[0037] In some embodiments, on a large surface perpendicular to the stacked core 3, the positive electrode tabs 112 of the stacked core 3 are stacked, and the negative electrode tabs 122 of the stacked core 3 are stacked; on the large surface of the stacked core 3, the positive electrode tabs 112 and the negative electrode tabs 122 are spaced apart in a first direction, and the positive electrode tabs 112 and the negative electrode tabs 122 are located at the same end of the stacked core 3 in a second direction, wherein the first direction is perpendicular to the second direction.

[0038] In some embodiments, the electrode 1 is a sheet-like structure, and multiple electrode sheets 1 include a positive electrode sheet 11 and a negative electrode sheet 12. In the stacking direction of the electrode sheets 1, the positive electrode ears 112 of all positive electrode sheets 11 are stacked, and the negative electrode ears 122 of all negative electrode sheets 12 are stacked, and the positive electrode ears 112 and the negative electrode ears 122 are located at the same end of the electrode sheet 1.

[0039] Specifically, the “stacking direction of the electrode 1” refers to the stacking direction of the positive electrode 11 and the negative electrode 12, that is, Figure 3 、 Figures 9-10 The F5-F6 direction in the first direction is Figures 1-2 、 Figures 6-7 In the F1 direction, the positive electrode ear 112 is spaced apart from the negative electrode ear 122 to prevent the positive electrode ear 112 from contacting the negative electrode ear 122 and causing a short circuit. Figure 1 F3 direction in.

[0040] The tape 2 is an insulating tape positioned between the positive tab 112 and the negative tab 122. The tape 2 covers the end surface of the stacked core 3 at least in the stacking direction of the multiple electrode sheets 1. A large distance between the positive electrode sheets 11 and the negative electrode sheets 12 in the stacking direction can lead to lithium deposition on the electrode sheets 1. In this embodiment, the tape 2 secures the stacked core 3, minimizing the distance between the positive electrode sheets 11 and the negative electrode sheets 12 in the stacking direction and reducing the risk of lithium deposition at the top of the battery cell 10 in the later stages of cycling. In order to pursue high energy efficiency, the traditional battery cells with tabs on the same side have the tab size occupying more than 40% of the electrode sheet in the first direction. The small distance between the positive tab and the negative tab can easily cause the risk of internal short circuit between the tabs. The insulating tape 2 of this embodiment separates the positive tab 112 from the negative tab 122, which can avoid the positive and negative poles from overlapping under abnormal circumstances between the positive tab 112 and the negative tab 122. This can solve the risk of internal short circuit in the battery cell 10 caused by the small distance between the positive tab 112 and the negative tab 122, and improve the safety performance of the battery 100.

[0041] Reference Figure 1 As shown, the stacked core 3 has a first end surface 33 , and the adhesive tape 2 covers the first end surface 33 of the stacked core 3 at least in the stacking direction of the plurality of pole pieces 1 , so as to adhere and fix the interlayer pole pieces 1 from the end surface of the stacked core 3 .

[0042] In some embodiments, the tape 2 is an insulating tape made of PI (Polyimide). PI is resistant to high temperatures and prevents the positive and negative tabs 112 and 122 from being damaged by the tape 2 and causing insulation failure.

[0043] Reference Figure 1 As shown, the positive electrode tab 112, the tape 2, and the negative electrode tab 122 are spaced apart in the width direction of the stacked core 3. In the width direction of the stacked core 3, the minimum distance between the tape 2 and the positive electrode tab 112 is L1, and the minimum distance between the tape 2 and the negative electrode tab 122 is L2, satisfying the following conditions: 2mm≤L1≤5mm, and 2mm≤L2≤5mm. Specifically, the width direction of the stacked core 3 is in the same direction as the first direction. L1 refers to the minimum distance between the tape 2 and the positive electrode tab 112 in the first direction, and L2 refers to the minimum distance between the tape 2 and the negative electrode tab 122 in the first direction.

[0044] The injection hole on the traditional battery shell is designed between the positive and negative tabs of the battery cell. During the negative pressure formation and injection process of the battery cell, the electrolyte easily rushes directly to the positive and negative tabs, causing the top of the tab to fall off, causing a micro-short circuit in the battery cell, and abnormal self-discharge causing the system end life to decrease. When the battery 100 of this embodiment is used in the battery 100, the battery cell 10 is installed inside the shell 20 of the battery 100. The shell 20 is provided with an injection hole 201. The injection hole 201 is designed between the positive tab 112 and the negative tab 122. When the shell 20 is injected through the injection hole 201, the electrolyte directly impacts the tape 2 instead of the tab 1. This can avoid the impact of the electrolyte on the tab 1 during the negative pressure formation process of the battery cell 10, prevent the abnormal self-discharge of the battery 100 caused by the tab 1 falling off, and help to improve the service life of the battery cell 10.

[0045] Due to the tolerances of the adhesive laminating process and the tab cutting tolerances, when the minimum distance between the tape 2 and the positive tab 112 is less than 2 mm, the tape 2 is likely to interfere with the positive tab 112. Taking into account the tolerances of the adhesive laminating process and the tab cutting tolerances, the minimum distance between the tape 2 and the positive tab 112 is 2 mm, which can ensure that the tape 2 and the positive tab 112 do not interfere.

[0046] When the minimum distance between the tape 2 and the positive electrode ear 112 is greater than 5 mm, since the distance between the positive electrode ear 112 and the negative electrode ear 122 is certain, this will cause the size of the tape 2 in the first direction to become smaller, so that the binding force of the tape 2 on the stacked core 3 is reduced, affecting the binding effect of the tape 2 on the stacked core 3. At the same time, since the tape 2 becomes narrower in the first direction, the electrolyte injected from the injection hole 201 can easily impact the electrode 1 and cannot completely impact the tape 2. In order to more comprehensively cover the stacked core 3 and prevent the electrolyte from impacting the electrode 1 during the injection process, the maximum distance between the tape 2 and the positive electrode ear 112 is 5 mm.

[0047] Similarly, due to the tolerances of the adhesive lamination process and the tab cutting tolerances, when the minimum distance between the tape 2 and the negative tab 122 is less than 2 mm, the tape 2 is likely to interfere with the negative tab 122. Taking into account the tolerances of the adhesive lamination process and the tab cutting tolerances, the minimum distance between the tape 2 and the negative tab 122 is 2 mm, which can ensure that the tape 2 and the negative tab 122 do not interfere.

[0048] When the minimum distance between the tape 2 and the negative electrode ear 122 is greater than 5 mm, since the distance between the negative electrode ears 122 and the negative electrode ears 122 is certain, this will cause the size of the tape 2 in the first direction to become smaller, so that the binding force of the tape 2 on the stacked core 3 is reduced, affecting the binding effect of the tape 2 on the stacked core 3. At the same time, since the tape 2 becomes narrower in the first direction, the electrolyte injected from the injection hole 201 can easily impact the electrode 1 and cannot completely impact the tape 2. In order to more comprehensively cover the stacked core 3 and prevent the electrolyte from impacting the electrode 1 during the injection process, the maximum distance between the tape 2 and the negative electrode ear 122 is 5 mm.

[0049] Optionally, L1 can be 2mm, 3mm, 4mm, 5mm, or other values ​​within the range of 2mm to 5mm, and L2 can be 2mm, 3mm, 4mm, 5mm, or other values ​​within the range of 2mm to 5mm, which are not listed here one by one.

[0050] In some embodiments, L1 and L2 are equal.

[0051] In other embodiments, L1 and L2 are not equal.

[0052] In some embodiments, the number of positive electrode sheets 11 is at least one, and the number of negative electrode sheets 12 is at least one. When multiple electrode sheets 1 are stacked, m positive electrode sheets 11 can form a positive electrode sheet group, and n negative electrode sheets 12 can form a negative electrode sheet group, and the positive electrode sheet groups and the negative electrode sheet groups can be stacked alternately in sequence, wherein m can be a positive integer such as 1, 2, 3..., and n can be a positive integer such as 1, 2, 3.... The number of positive electrode sheets 11 included in the positive electrode sheet groups at different positions can be equal or unequal. The number of negative electrode sheets 12 included in the negative electrode sheet groups at different positions can be equal or unequal. For example, 3 positive electrode sheets 11, 2 negative electrode sheets 12, 4 positive electrode sheets 11, 3 negative electrode sheets 12 can be stacked in this way, or 3 positive electrode sheets 11, 2 negative electrode sheets 12, 3 positive electrode sheets 11, 2 negative electrode sheets 12 can be stacked in this way. Adjacent positive electrode sheet groups and negative electrode sheet groups are separated by separators 4 to prevent the positive electrode sheets 11 and negative electrode sheets 12 from contacting each other and causing a short circuit.

[0053] In some embodiments, the positive electrode sheet 11 and the negative electrode sheet 12 may be alternately stacked in sequence, for example: the negative electrode sheet 12, the positive electrode sheet 11, the negative electrode sheet 12, the positive electrode sheet 11, the negative electrode sheet 12, the positive electrode sheet 11, the negative electrode sheet 12, etc. are alternately stacked in sequence, such as Figures 9-10 shown.

[0054] According to the battery cell 10 of the embodiment of the present application, by setting the minimum distance between the tape 2 and the positive electrode ear 112 to 2mm~5mm, and setting the minimum distance between the tape 2 and the negative electrode ear 122 to 2mm~5mm, the distance between the tape 2 and the positive electrode ear 112 and the negative electrode ear 122 is relatively appropriate, which can not only ensure that the tape 2 does not interfere with the positive electrode ear 112 and the negative electrode ear 122, but also avoid the electrolyte from directly impacting the electrode piece 1 during the injection process, prevent the battery 100 from self-discharge abnormality caused by the electrode piece 1 falling off, and improve the safety and life of the battery 100.

[0055] In some embodiments, reference Figure 1 As shown, the tape 2 is provided with a coding area 24. In related art, some battery cells require additional tape with a QR code to facilitate traceability of the stacked cores, which is a complex and costly process. The battery cell 10 of this embodiment has a coding area 24 on its tape 2. This tape 2 not only secures the stacked cores 3 but also replaces the coding tape, reducing the overall cost of the battery cell 10. A code (such as a QR code or other identification code) engraved on the coding area 24 enables traceability of the stacked cores 3.

[0056] In addition, setting L1 and L2 to no more than 5 mm can ensure that the size of the tape 2 in the F1 - F2 direction is not too small, thereby meeting the size requirement of the code area 24 in the F1 - F2 direction.

[0057] In some embodiments, the thickness of the tape 2 is 25 μm to 35 μm. When the thickness of the tape 2 is less than 25 μm, the insulation and voltage resistance performance of the tape 2 deteriorates. When the thickness of the tape 2 is greater than 35 μm, the cost of the tape 2 increases significantly. Therefore, designing the thickness of the tape 2 to be 25 μm to 35 μm ensures that the tape 2 has good insulation and voltage resistance performance while ensuring that the cost of the tape 2 is not too high.

[0058] Specifically, the thickness of the tape 2 is H, 25 μm ≤ H ≤ 35 μm. Optionally, H can be 25 μm, 27 μm, 30 μm, 33 μm, 35 μm, or other values ​​within the range of 25 μm to 35 μm, which are not listed here.

[0059] In some embodiments, the laminated core 3 has a large surface (i.e., a first large surface 31 and a second large surface 32), and the adhesive tape 2 extends from the end surface of the laminated core 3 toward the large surface. The extension length of the adhesive tape 2 on the large surface is 15 mm to 35 mm. When the extension length of the adhesive tape 2 on the large surface is less than 15 mm, the adhesive tape 2 has a small fixing force on the laminated core 3, and the fixing effect is weak. When the extension length of the adhesive tape 2 on the large surface is greater than 35 mm, the cost of the adhesive tape 2 increases significantly. Therefore, designing the extension length of the adhesive tape 2 on the large surface to be 15 mm to 35 mm can ensure that the adhesive tape 2 has a large fixing force on the laminated core 3, while also saving the cost of the adhesive tape 2 and avoiding waste.

[0060] Specifically, the extension length of the tape 2 on the large surface is L3, 15mm≤L3≤35mm. Optionally, L3 can be 15mm, 17mm, 20mm, 23mm, 25mm, 27mm, 30mm, 33mm, 35mm, or other values ​​within the range of 15mm to 35mm, which are not listed here one by one.

[0061] In some embodiments, reference Figures 1-2 、 Figures 6-7 、 Figure 11 As shown, the positive electrode sheet 11 includes a positive electrode sheet body 111, a positive electrode ear 112 is connected to the positive electrode sheet body 111, and the positive electrode ear 112 extends outward relative to the positive electrode sheet body 111; the negative electrode sheet 12 includes a negative electrode sheet body 121, a negative electrode ear 122 is connected to the negative electrode sheet body 121, and the extension direction of the negative electrode ear 122 relative to the negative electrode sheet body 121 is the same as the extension direction of the positive electrode ear 112; the tape 2 extends on the large surface in the opposite direction of the extension of the negative electrode ear 122.

[0062] Specifically, the positive tab 112 extends in the second direction relative to the positive electrode body 111 , the negative tab 122 extends in the second direction relative to the negative electrode body 121 , and the tape 2 extends in the opposite direction of the second direction on the large surface, and the second direction is perpendicular to the first direction.

[0063] Specifically, the second direction is Figure 1 The F3 direction in the second direction is Figure 1 The positive electrode tab 112 extends in the F3 direction relative to the positive electrode sheet body 111, and the negative electrode tab 122 extends in the F3 direction relative to the negative electrode sheet body 121. The tape 2 extends along the F4 direction on the large surface. This prevents the tape 2 from deflecting toward the positive electrode tab 112 or the negative electrode tab 122 in the F1-F2 direction, making the tape 2 application process more convenient.

[0064] In addition, setting L3 to be no less than 15 mm can ensure that the size of the tape 2 in the F3 - F4 direction is not too small, thereby meeting the size requirement of the code area 24 in the F3 - F4 direction.

[0065] In some embodiments, as Figure 1 、 Figures 6-7 As shown, the positive electrode sheet body 111 and the negative electrode sheet body 121 are stacked, and the positive electrode sheet body 111 and the negative electrode sheet body 121 have a electrode thinning area 13 at the protruding end of the corresponding electrode ear. The extension length L3 of the tape 2 on the large surface is greater than the length L4 of the electrode thinning area 13 in the same direction. In other words, the extension length L3 of the tape 2 on the large surface is greater than the length L4 of the electrode thinning area 13 in the second direction, that is, L3>L4.

[0066] The traditional same-side tab cell is affected by the top tab thinning area. In the later stage of the cycle, the tab expansion leads to the increase of the distance between the positive tab and the negative tab, and the lithium precipitation in the top tab thinning area leads to the rapid attenuation of the cycle life of the cell. In the cell 10 of the embodiment, the extension length of the adhesive tape 2 on the large face is designed as L3 greater than the length L4 of the tab thinning area 13 in the second direction, so that the adhesive tape 2 can make the positive tab body 111 and the negative tab body 121 corresponding to the tab thinning area 13 closer and more closely attached, reduce the risk of lithium precipitation at the top end of the cell 10 in the later stage of the cycle, and improve the life of the cell 10.

[0067] In some embodiments, as shown in Figures 1-2 , Figure 4 , Figure 8 , the adhesive tape 2 is configured as an "L" shape. The adhesive tape 2 includes a first segment 21 and a second segment 22, the first segment 21 and the second segment 22 are connected, the cell core 3 has a first large face 31, a second large face 32, a first end face 33 and a second end face 34, the first large face 31 and the second large face 32 face away from each other, the first end face 33 and the second end face 34 face away from each other, the positive tab 112 and the negative tab 122 both extend from the first end face 33, the first segment 21 is attached to the first large face 31, and the second segment 22 is attached to the first end face 33. Thus, the adhesive tape 2 can fix the tab 1 from two directions, i.e. the adhesive tape 2 wraps the tab 1 from the top and the bottom, and the fixing effect on the tab 1 is good, which can effectively prevent the tab 1 from loosening.

[0068] In some embodiments, as shown in Figures 1-3 , Figure 5 , Figure 8 , the adhesive tape 2 is configured as a "C" shape. The adhesive tape 2 includes a first segment 21, a second segment 22 and a third segment 23, the second segment 22 connects the first segment 21 and the third segment 23, the first segment 21 is attached to the first large face 31, the second segment 22 is attached to the first end face 33, and the third segment 23 is attached to the second large face 32. Thus, the adhesive tape 2 can fix the tab 1 from three directions, i.e. the adhesive tape 2 wraps the tab 1 from the top, the bottom and the side, and the fixing effect on the tab 1 is good, which can effectively prevent the tab 1 from loosening.

[0069] In some embodiments, as shown in Figures 9-10 , the cell 10 further includes a separator 4, and the positive tab 11 and the negative tab 12 are separated by the separator 4, so that the positive tab 11 and the negative tab 12 can be prevented from contacting and short-circuiting.

[0070] In some embodiments, as shown in Figure 9 , the separator 4 separates the positive tab 11 and the negative tab 12 in a zigzag shape.

[0071] In other embodiments, as shown in Figure 10As shown, the separator 4 is a slice separator, and a single-piece separator 4 is provided between the positive electrode sheet 11 and the negative electrode sheet 12 .

[0072] Reference Figure 11 As shown, a battery 100 according to another embodiment of the present application includes a housing 20 and a battery cell 10 according to the above embodiment. The housing 20 is provided with an injection hole 201, and the projection of the injection hole 201 on the battery cell 10 is located on the tape 2. In this way, when electrolyte is injected into the interior of the housing 20 through the injection hole 201, the electrolyte directly impacts the tape 2 instead of the electrode 1. This can avoid the impact of the electrolyte on the electrode 1 during the negative pressure formation process of the battery cell 10, prevent abnormal self-discharge of the battery 100 caused by the electrode 1 falling off, and help to extend the service life of the battery cell 10.

[0073] It is understood that the "projection of the injection hole 201 on the battery cell 10" refers to the projection of the injection hole 201 on a plane perpendicular to the injection direction. When the injection hole 201 is a circular hole, the "projection of the injection hole 201 on the battery cell 10" refers to the projection of the injection hole 201 on a plane perpendicular to the axis of the injection hole 201.

[0074] According to the battery 100 of the embodiment of the present application, its battery cell 10 sets the minimum distance between the tape 2 and the positive electrode ear 112 to 2mm~5mm, and the minimum distance between the tape 2 and the negative electrode ear 122 to 2mm~5mm, so that the distance between the tape 2 and the positive electrode ear 112 and the negative electrode ear 122 is relatively appropriate, which can not only ensure that the tape 2 does not interfere with the positive electrode ear 112 and the negative electrode ear 122, but also avoid the electrolyte from directly impacting the electrode piece 1 during the injection process, and prevent the battery 100 from self-discharge abnormality caused by the electrode piece 1 falling off, thereby improving the safety and life of the battery 100, and further improving the safety and life of the battery 100.

[0075] According to another embodiment of the present application, an electric device includes the battery 100 of the above embodiment.

[0076] According to the electrical equipment of the embodiment of the present application, the battery cell 10 sets the minimum distance between the tape 2 and the positive electrode ear 112 to 2mm~5mm, and the minimum distance between the tape 2 and the negative electrode ear 122 to 2mm~5mm, so that the distance between the tape 2 and the positive electrode ear 112 and the negative electrode ear 122 is relatively appropriate, which can not only ensure that the tape 2 does not interfere with the positive electrode ear 112 and the negative electrode ear 122, but also avoid the electrolyte from directly impacting the electrode piece 1 during the injection process, and prevent the battery 100 from self-discharge abnormality caused by the electrode piece 1 falling off, thereby improving the safety and life of the battery 100, and further improving the safety and life of the battery 100.

[0077] Optionally, the electrical equipment may be a vehicle, a ship, an airplane, a machine tool, a household appliance, etc.

[0078] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0079] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "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 application, the illustrative 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. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0081] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A battery cell (10), characterized in that: include: A stacked core (3), wherein the stacked core (3) is formed by stacking a plurality of electrode sheets (1), one end of the stacked core (3) extends to form a positive electrode tab (112) and a negative electrode tab (122), and the positive electrode tab (112) and the negative electrode tab (122) are spaced apart; An insulating tape (2), the tape (2) being located between the positive electrode tab (112) and the negative electrode tab (122), the tape (2) covering the end face of the stacked core (3) at least in the stacking direction of the plurality of electrode sheets (1), the positive electrode tab (112), the tape (2) and the negative electrode tab (122) being arranged at intervals in the width direction of the stacked core (3), the minimum distance between the tape (2) and the positive electrode tab (112) being L1, and the minimum distance between the tape (2) and the negative electrode tab (122) being L2 in the width direction of the stacked core (3), satisfying the following conditions: 2 mm ≤ L1 ≤ 5 mm, 2 mm ≤ L2 ≤ 5 mm.

2. The battery cell (10) according to claim 1, characterized in that The adhesive tape (2) is provided with a code engraving area (24).

3. The battery cell (10) according to claim 1, characterized in that The thickness of the adhesive tape (2) is 25um to 35um.

4. The battery cell (10) according to claim 1, characterized in that The stacked core (3) has a large surface, and the adhesive tape (2) extends from the end surface of the stacked core (3) toward the large surface. The extension length of the adhesive tape (2) on the large surface is 15 mm to 35 mm.

5. The battery cell (10) according to claim 4, characterized in that The plurality of electrode sheets (1) include a positive electrode sheet (11) and a negative electrode sheet (12); the positive electrode sheet (11) includes a positive electrode sheet body (111); the positive electrode ear (112) is connected to the positive electrode sheet body (111); the positive electrode ear (112) extends outward relative to the positive electrode sheet body (111); the negative electrode sheet (12) includes a negative electrode sheet body (121); the negative electrode ear (122) is connected to the negative electrode sheet body (121); the extension direction of the negative electrode ear (122) relative to the negative electrode sheet body (121) is the same as the extension direction of the positive electrode ear (112); and the tape (2) extends on the large surface in the opposite direction to the extension direction of the negative electrode ear (122).

6. The battery cell (10) according to claim 5, characterized in that The positive electrode sheet body (111) and the negative electrode sheet body (121) are stacked, and the positive electrode sheet body (111) and the negative electrode sheet body (121) have electrode sheet thinning areas (13) at the extended ends of the corresponding electrode ears, and the extension length of the tape (2) on the large surface is greater than the length of the electrode sheet thinning area (13) in the same direction.

7. The battery cell (10) according to any one of claims 1 to 6, characterized in that: The adhesive tape (2) comprises a first section (21) and a second section (22), the first section (21) and the second section (22) being connected, the stacked core (3) having a first large surface (31), a second large surface (32), a first end surface (33) and a second end surface (34), the first large surface (31) and the second large surface (32) facing away from each other, the first end surface (33) and the second end surface (34) facing away from each other, the positive electrode ear (112) and the negative electrode ear (122) both extending from the first end surface (33), the first section (21) being attached to the first large surface (31), and the second section (22) being attached to the first end surface (33).

8. The battery cell (10) according to claim 7, characterized in that The adhesive tape (2) further comprises a third section (23), the second section (22) connects the first section (21) and the third section (23), and the third section (23) is attached to the second large surface (32).

9. A battery (100), characterized in that: The invention comprises a shell (20) and a battery cell (10) according to any one of claims 1 to 8, wherein the shell (20) is provided with a liquid injection hole (201), and the projection of the liquid injection hole (201) on the battery cell (10) is located on the tape (2).

10. An electrical device, characterized in that: A battery (100) comprising the battery (100) according to claim 9.

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