Battery cells and electrical equipment

Abstract

The present invention relates to a battery cell and an electric power using equipment. The battery cell includes an electrode assembly, a packaging bag, an inner tab, and an outer tab, the packaging bag includes a main body and a border, the electrode assembly and the inner tab are both housed in the main body, a first end of the inner tab is connected to the electrode assembly, a second end of the inner tab is connected to one end of the outer tab, the border is connected to a top wall of the main body, and the other end of the outer tab protrudes from the border to the outside of the packaging bag, and in the thickness direction of the battery cell, the top wall includes a first portion and a second portion located on both sides of the sealed edge portion, and a first height from the first portion to a bottom wall of the main body is smaller than a second height from the second portion to the bottom wall of the main body. By positioning at least a portion of the inner tab and the connection point between the inner tab and the outer tab to correspond to the second portion, the overall dimensions of the battery cell are reduced, and outside the packaging bag of the battery cell, the space left between the second portion and the first portion can be used by external power-using equipment, thereby expanding the range of applications of the battery cell.

Description

[Technical Field]

[0001] The present invention relates to the field of battery technology, and more particularly to battery cells and power-using equipment. [Background technology]

[0002] A battery cell is a device that converts external energy into electrical energy, stores it internally, and supplies power to external electrical devices (such as portable electronic devices) when needed. Currently, battery cells are widely used in electronic devices such as drones, mobile phones, tablets, and laptops. Generally, a battery cell includes an electrode assembly, a packaging bag, an inner tab, and an outer tab. The packaging bag includes a body, and the electrode assembly and inner tab are both housed in the body. A first end of the inner tab is connected to the electrode assembly, and a second end of the inner tab is connected to the outer tab.

[0003] In the process of realizing this application, the applicant of the present application discovered that, currently, electrode assemblies are connected by inner tabs and outer tabs, and the inner tabs and the connection points between the inner tabs and outer tabs occupy a certain amount of storage space, which increases the size of the battery cell and reduces its applicability to electronic devices, thereby limiting the range of application of the battery cell. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a battery cell and electrical equipment that solves the problem of the relatively large size of the battery cell in the prior art, which is caused by the inner tab and the connection point between the inner tab and the outer tab occupying a certain amount of storage space. [Means for solving the problem]

[0005] According to one aspect of the present application, there is provided a battery cell comprising an electrode assembly, a packaging bag, an inner tab, and an outer tab, the packaging bag comprising a main body and a rim, the electrode assembly and the inner tab are both housed in the main body, a first end of the inner tab is connected to the electrode assembly, a second end of the inner tab is connected to one end of the outer tab, the rim is connected to a top wall of the main body, and the other end of the outer tab protrudes from the rim to the outside of the packaging bag, and in the thickness direction of the battery cell, the top wall comprises a first portion and a second portion located on either side of the sealing edge portion, and a first height from the first portion to the bottom wall of the main body is smaller than a second height from the second portion to the bottom wall of the main body. By positioning at least a portion of the inner tab and the connection point between the inner tab and the outer tab so that they correspond to the second portion, the overall dimensions of the battery cell are reduced, and the space left between the second portion and the first portion outside the packaging bag for the battery cell can be used for external power-using equipment, thereby expanding the range of applications of the battery cell.

[0006] In one alternative embodiment, the outer tab includes a connecting portion and an extension portion bent from the connecting portion and projecting outward from the edging portion, the connecting portion corresponding to the second portion, the second end of the inner tab extending toward the second portion and bent from a point close to the second portion toward the first portion, and further connected to the connecting portion after being bent, thereby connecting the inner tab to the outer tab via the connecting portion of the outer tab, the connecting portion corresponding to the second portion, and the overall size of the battery cell being small.

[0007] In one alternative embodiment, the electrode assembly includes a first electrode sheet, a second electrode sheet, and a separator positioned between the first electrode sheet and the second electrode sheet; the first electrode sheet, the separator, and the second electrode sheet are wound together to form a wound structure; the inner tabs include a plurality of first inner tabs and a plurality of second inner tabs, and the outer tabs include a first outer tab and a second outer tab; First ends of the first inner tabs are connected to a first electrode sheet, and second ends of the first inner tabs are connected to a first outer tab; The first ends of the second inner tabs are connected to the second electrode sheet, and the second ends of the second inner tabs are connected to a second outer tab that extends from the edging portion to the outside of the packaging bag. Thus, by providing a plurality of first inner tabs and second inner tabs, the charge / discharge performance of the battery cell is improved.

[0008] In one alternative embodiment, each circumference of the first electrode sheet is connected to a first end of one of the first inner tabs, the connection points between the first electrode sheet and each of the first inner tabs are all located on the same semicircle of the wound structure, and the connection points between the first electrode sheet and each of the first inner tabs all correspond to the second portion, and / or Each circumference of the second electrode sheet is connected to the first end of one of the second inner tabs, and the connection points between the second electrode sheet and each of the second inner tabs are all located on the same semicircle of the wound structure, and the connection points between the second electrode sheet and each of the second inner tabs all correspond to the second portion. Thus, in the electrode assembly with a wound structure, by arranging the multiple first inner tabs and the multiple second inner tabs on the same semicircle, the height difference between the second height corresponding to the second portion and the first height corresponding to the first portion becomes large, and the space between the second portion and the first portion outside the packaging bag of the battery cell becomes large.

[0009] In one alternative embodiment, the height difference between the second height and the first height is 0.6 mm to 1.2 mm.

[0010] In one optional embodiment, the height difference between the second height and the first height is 0.8 mm to 1.0 mm.

[0011] In one alternative embodiment, the difference in height between the second height and the first height is 0.9 mm.

[0012] In one alternative embodiment, every half circumference of the first electrode sheet is connected to a first end of one of the first inner tabs; two connection points between each circumference of the first electrode sheet and the first inner tab are respectively distributed within two semicircles of the winding structure; wherein one semicircle of the winding structure corresponds to the first portion, and the other semicircle of the winding structure corresponds to the second portion; Each periphery of the second electrode sheet is connected to a first end of one of the second inner tabs; The connection points between the second electrode sheet and each of the second inner tabs are all distributed within the same semicircle of the wound structure. As a result, in the electrode assembly with a wound structure, even if the multiple first inner tabs are distributed over two semicircles of the wound structure, the connection portion between the inner tab and the outer tab corresponds to the second portion, so the corresponding first height of the first portion is still smaller than the second height of the second portion, and therefore a certain space is left between the second portion and the first portion outside the packaging bag of the battery cell.

[0013] In one alternative embodiment, every lap of the first electrode sheet is connected to a first end of the first inner tab, and the connection points between the first electrode sheet and each of the first inner tabs are all distributed within the same semicircle of the winding structure. Every semicircle of the second electrode sheet is connected to a first end of one of the second inner tabs, and the two connection points between every lap of the second electrode sheet and each of the second inner tabs are distributed within two semicircles of the winding structure. Here, one semicircle of the winding structure corresponds to the first portion, and the other semicircle of the winding structure corresponds to the second portion. Thus, in an electrode assembly with a winding structure, even if multiple second inner tabs are distributed within two semicircles of the winding structure, the connection points between the inner tabs and the outer tabs correspond to the second portion, so the first height corresponding to the first portion is still smaller than the second height corresponding to the second portion, and therefore a certain space is left between the second portion and the first portion outside the packaging bag for the battery cell.

[0014] In one alternative embodiment, a first end of one of the first inner tabs is connected to each half-circle of the first electrode sheet, and two connection points between each half-circle of the first electrode sheet and the first inner tab are respectively distributed within two semicircles of the wound structure; a first end of one of the second inner tabs is connected to every half circumference of the second electrode sheet, and two connection points between every circumference of the second electrode sheet and the second inner tab are respectively distributed within two semicircles of the winding structure; Here, one semicircle of the winding structure corresponds to the first portion, and the other semicircle of the winding structure corresponds to the second portion. In the electrode assembly having a winding structure, even if the plurality of first inner tabs are distributed among the two semicircles of the winding structure and the plurality of second inner tabs are distributed among the two semicircles of the winding structure, the first height corresponding to the first portion is still smaller than the second height corresponding to the second portion because the connection portion between the inner tabs and the outer tabs corresponds to the second portion. This leaves a certain space between the second portion and the first portion outside the packing bag for the battery cell.

[0015] In one optional embodiment, the height difference between the second height and the first height is 0.2 mm to 0.8 mm.

[0016] In one optional embodiment, the height difference between the second height and the first height is 0.4 mm to 0.6 mm.

[0017] In one alternative embodiment, the difference in height between the second height and the first height is 0.5 mm.

[0018] In one alternative embodiment, the device further includes a plurality of first insulating rubbers and a plurality of second insulating rubbers, Both ends of one of the first insulating rubbers are attached to one surface of the first end of one of the first inner tabs and to a surface of the material layer of the first electrode sheet, respectively; and / or Both ends of one of the second insulating rubbers are attached to one surface of the first end of one of the second inner tabs and to the surface of the material layer of the second electrode sheet, respectively. By providing the first insulating rubber and the second insulating rubber, it is possible to improve the short circuit phenomenon between the first electrode sheet and the second electrode sheet.

[0019] In one alternative embodiment, the device further includes a first tab rubber and a second tab rubber, the first tab rubber is used to seal the connection between the first outer tab and the edging portion; The second tab rubber is used to seal the connection between the second outer tab and the edging. The provision of the first and second tab rubbers makes it less likely for the battery cell to leak at the connection between the outer tab and the packaging bag.

[0020] According to another aspect of the present application, there is also provided a power consumption facility including a load and any one of the battery cells described above, the load and the battery cell being electrically connected to each other. [Effects of the Invention]

[0021] In a battery cell and power-using equipment according to an embodiment of the present application, the battery cell includes an electrode body and a rim. In the thickness direction of the battery cell, the top wall of the body includes a first portion and a second portion located on either side of the rim. Here, a first height from the first portion to the bottom wall of the body is smaller than a second height from the second portion to the bottom wall of the body. By arranging at least a portion of the inner tab and the connection point between the inner tab and the outer tab to correspond to the second portion, the overall size of the battery cell is reduced, and the space between the second portion and the first portion can be used for external power-using equipment, thereby expanding the range of applications of the battery cell. [Brief explanation of the drawings]

[0022] One or more embodiments are illustrated by pictures in corresponding drawings, but these illustrative descriptions do not constitute limitations of the embodiments. Unless otherwise specified, elements in the drawings with the same reference numerals are represented as similar elements. Furthermore, the proportions of the figures in the drawings are not limited.

[0023] [Figure 1] 1 is a cross-sectional view of a battery cell provided in accordance with an embodiment of the present application. [Figure 2]1 is another representation of a cross-sectional view of a battery cell provided by an embodiment of the present application. [Figure 3] 1 is a cross-sectional view of one type of connection between an electrode assembly and an inner tab in a wound structure provided by an embodiment of the present application; [Figure 4] 1 is yet another representation of a cross-sectional view of a battery cell provided by an embodiment of the present application. [Figure 5] 1 is a further representation of a cross-sectional view of a battery cell provided by an embodiment of the present application. [Figure 6] 1 is a further representation of a cross-sectional view of a battery cell provided by an embodiment of the present application. [Figure 7] 10 is a cross-sectional view of a further connection between an electrode assembly and an inner tab of a wound structure provided by an embodiment of the present application. FIG. [Figure 8] 10 is a cross-sectional view of another connection configuration between an electrode assembly and an inner tab of a wound structure provided by an embodiment of the present application. FIG. [Figure 9] 10 is a cross-sectional view of a further connection between an electrode assembly and an inner tab of a wound structure provided by an embodiment of the present application. FIG. [Figure 10] 10A and 10B are cross-sectional views of further connection modes between an electrode assembly and an inner tab of a winding structure provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0024] To clarify the objectives, technical methods, and advantages of the embodiments of the present application, the following provides a clear and complete description of the technical methods in the embodiments of the present application in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. The specific embodiments described herein are used only to explain the present application and are not intended to limit the present application. All other examples obtained by those skilled in the art based on the examples herein without creative effort fall within the scope of protection of the present application. It should be noted that when a component is referred to as being "fixed" to another component, it may be directly fixed to the other component, or there may be one or more media between them. Furthermore, when a component is referred to as being "connected" to another component, it may be directly connected to the other component, or there may be one or more media between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are used for descriptive purposes only.

[0025] Furthermore, the technical features of each embodiment of the present application described below may be combined with each other as long as they are not contradictory. As shown in FIGS. 1 and 2 , a battery cell 100 includes an electrode assembly 1, a packaging bag 2, an inner tab 3, and an outer tab 4. The packaging bag 2 includes a main body 21 and a rim 22. The electrode assembly 1 is housed in the main body 21. The inner tab 3 is connected to the electrode assembly 1 and the outer tab 4, respectively. The rim 22 is connected to a top wall 211 of the main body 21. The outer tab 4 protrudes from the rim 22 to the outside of the packaging bag 2. In the thickness direction L3 of the battery cell 100, the top wall 211 includes a first portion 2111 and a second portion 2112 located on both sides of the rim 22. Here, a first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is smaller than a second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21. By arranging at least the inner tab 3 and the connection point between the inner tab 3 and the outer tab 4 to correspond to the second portion 2112, the overall dimensions of the battery cell 100 are small, and the space 2a between the second portion 2112 and the first portion 2111 outside the packaging bag 2 of the battery cell 100 can be used for external power-using equipment. This broadens the range of applications of the battery cell 100.

[0026] Regarding the electrode assembly 1 described above, in some embodiments, as shown in Figure 3, the electrode assembly 1 includes a first electrode sheet 11, a second electrode sheet 12, and a separator 13 disposed between the first electrode sheet 11 and the second electrode sheet 12. The first electrode sheet 11, the separator 13, and the second electrode sheet 12 are wound together to form a wound structure.

[0027] Here, the first electrode sheet 11 is a positive electrode sheet and the second electrode sheet 12 is a negative electrode sheet, or alternatively, the first electrode sheet 11 is a negative electrode sheet and the second electrode sheet 12 is a positive electrode sheet.

[0028] The wound structure has a flat portion 11s and a curved portion 12s. Here, the flat portion 11s is a portion where the first electrode sheet 11, the separator 13, or the second electrode sheet 12 extends straight. The curved portion 12s is a portion where the first electrode sheet 11, the separator 13, or the second electrode sheet 12 extends and curves toward the flat portion 11s. In this embodiment, the direction in which the outer tab 4 extends from the edging portion 22 to the outside of the packaging bag 2 is defined as a first direction L1, the direction in which the curved portion 12s extends and curves toward the flat portion 11s is defined as a second direction L2, and the direction perpendicular to the first direction L1 and the second direction L2 is defined as a thickness direction L3 of the battery cell 100.

[0029] Regarding the above-mentioned electrode assembly 1, in some embodiments, as shown in Figure 1, the electrode assembly 1 includes a first electrode sheet 11, a second electrode sheet 12, and a separator 13. The separator 13 is located between the first electrode sheet 11 and the second electrode sheet 12. The first electrode sheet 11, the separator 13, and the second electrode sheet 12 are sequentially stacked to form a laminated structure.

[0030] In the above-described laminated structure, the direction in which the outer tab 4 extends from the edging portion 22 to the outside of the packaging bag 2 is defined as the first direction L1. The direction in which the first electrode sheet 11, the separator 13, and the second electrode sheet 12 are laminated is defined as the thickness direction L3 of the battery cell 100.

[0031] 1 and 2, the packaging bag 2 includes a main body 21 and a hem 22. The main body 21 has a top wall 211 and a bottom wall 212. The top wall 211 and the bottom wall 212 are disposed opposite each other. The hem 22 is connected to the top wall 211. The hem 22 allows the outer tab 4 to extend from inside the packaging bag 2 to the outside of the packaging bag 2.

[0032] The edging portion 22 includes a first portion 2111 and a second portion 2112. In the thickness direction L3 of the battery cell 100, the first portion 2111 and the second portion 2112 are provided on both sides of the edging portion 22. Here, a first height h1 from the first portion 2111 to the bottom wall 212 of the main body portion 21 is smaller than a second height h2 from the second portion 2112 to the bottom wall 212 of the main body portion 21. In other words, in the first direction L1, the size of the area where the first portion 2111 is located with respect to the main body portion 21 of the packaging bag 2 is smaller than the size of the area where the second portion 2112 is located.

[0033] In the prior art, the first height h1 and the second height h2 are the same. The inner tabs 3 are distributed over the first portion 2111 and the second portion 2112. The connection points between the inner tabs 3 and the outer tabs 4 are located in the corresponding areas of the second portion 2112. A gap is left between the first portion 2111 and the electrode assembly 1 in the packaging bag 2. In the present embodiment, at least a portion of the inner tabs 3 and the connection points between the inner tabs 3 and the outer tabs 4 are located in the areas corresponding to the second portion 2112, and the first height h1 corresponding to the first portion 2111 is smaller than the height corresponding to the second portion 2112. This not only enables the placement of the inner tabs 3, but also prevents the overall dimensions of the battery cell 100 from increasing due to the installation of multiple inner tabs 3. Outside the packaging bag 2, the space 2a between the second portion 2112 and the first portion 2111 of the battery cell 100 is available for use by external power-using equipment.

[0034] 4, some of the inner tabs 3 may be located in an area corresponding to the second portion 2112, and other inner tabs 3 may be located in an area corresponding to the first portion 2111. Alternatively, multiple inner tabs 3 may be located by locating the connection points between the inner tabs 3 and the outer tabs 4 in an area corresponding to the second portion 2112. However, because the first height h1 corresponding to the first portion 2111 of the packaging bag 2 is smaller than the second height h2 corresponding to the second portion 2112, the overall dimensions of the battery cell 100 are small.

[0035] In some embodiments, the height difference h0 between the second height h2 and the first height h1 is 0.6 mm to 1.2 mm. In some embodiments, the height difference h0 is 0.8 mm to 1.0 mm. In some embodiments, h0 is preferably 0.9 mm.

[0036] Alternatively, in another embodiment, the height difference h0 between the second height h2 and the first height h1 is 0.2 mm to 0.8 mm. In another embodiment, the height difference h0 is 0.4 mm to 0.6 mm. In another embodiment, h0 is preferably 0.5 mm.

[0037] Regarding the inner tab 3 and outer tab 4 described above, as shown in Figures 1 and 2, a first end of the inner tab 3 is connected to the electrode assembly 1, a second end of the inner tab 3 is connected to one end of the outer tab 4, and the other end of the outer tab 4 protrudes outside the packaging bag 2 from the edging portion 22 of the packaging bag 2.

[0038] It should be noted that in some embodiments, the inner tab 3 is integrally formed with or welded to the electrode assembly 1 .

[0039] It should be noted that in some embodiments, the inner tab 3 is integrally formed with or welded to the outer tab 4 .

[0040] It should be noted that in some embodiments, the inner tab 3 is integrally molded with the electrode assembly 1 and is integrally molded with the outer tab 4 .

[0041] Note that in some embodiments, the inner tab 3 is welded to the electrode assembly 1 and to the outer tab 4 .

[0042] In some embodiments, the outer tab 4 includes a connecting portion 41 and an extending portion 42. Here, the connecting portion 41 corresponds to the second portion 2112 and is connected to the second end of the inner tab 3. The extending portion 42 is formed by bending and extending from the connecting portion 41, and extends outside the edging portion 22. The second end of the outer tab 4 extends toward the second portion 2112 and is bent toward the first portion 2111 near the second portion 2112. The second end of the inner tab 3 is connected to the connecting portion 41 after being bent toward the first portion 2111.

[0043] If there are a plurality of inner tabs 3, the second ends of the plurality of inner tabs 3 are connected to the connecting portions 41 of the outer tab 4, respectively.

[0044] It should be noted that the battery cell 100 typically has two types of inner tabs 3. One type of inner tab 3 and its connected outer tab 4 are the positive terminals of the battery cell 100, and the other type of inner tab 3 and its connected outer tab 4 are the negative terminals of the battery cell 100.

[0045] 3, 5, and 6, the inner tab 3 includes a plurality of first inner tabs 31 and a plurality of second inner tabs 32. The outer tab 4 includes a first outer tab 41s and a second outer tab 42s. First ends of the plurality of first inner tabs 31 are connected to the first electrode sheet 11, second ends of the plurality of first inner tabs 31 are connected to the first outer tab 41s, first ends of the plurality of second inner tabs 32 are connected to the second electrode sheet 12, and second ends of the plurality of second inner tabs 32 are connected to the second outer tab 42s, and the second outer tab 42s protrudes from the edging portion 22 to the outside of the packaging bag 2.

[0046] In some embodiments, the first inner tabs 31 are integrally formed with the first electrode sheet 11 or the first inner tabs 31 are welded to the first electrode sheet 11 .

[0047] In some embodiments, the plurality of second inner tabs 32 are integrally formed with the second electrode sheet 12 or the plurality of second inner tabs 32 are welded to the second electrode sheet 12 .

[0048] Furthermore, the first outer tab 41s and the second outer tab 42s both have a connecting portion 41 and an extending portion 42. The connecting portion 41 of the first outer tab 41s is for connecting to the second end of the first inner tab 31. The extending portion 42 of the first outer tab 41s protrudes from the edging portion 22 to the outside of the packaging bag 2. The connecting portion 41 of the second outer tab 42s is connected to the second end of the second inner tab 32. The extending portion 42 of the second outer tab 42s protrudes from the edging portion 22 to the outside of the packaging bag 2. Here, the connecting portion 41 of the first outer tab 41s corresponds to the second portion 2112, and the connecting portion 41 of the second outer tab 42s corresponds to the second portion 2112.

[0049] Regarding the inner tab 3, the outer tab 4, and the wound electrode assembly 1, in some embodiments, as shown in FIG. 3 , the inner tab 3, the outer tab 4, and the wound electrode assembly 1 form a semi-tab structure. In the semi-tab structure, every turn of the first electrode sheet 11 is connected to a first end of a first inner tab 31, and the connection points between the first electrode sheet 11 and each first inner tab 31 are all located on the same semicircle of the wound structure, and the connection points between the first electrode sheet 11 and each first inner tab 31 all correspond to the second portion 2112; and / or every turn of the second electrode sheet 12 is connected to a first end of a second inner tab 32, and the connection points between the second electrode sheet 12 and each second inner tab 32 are all located on the same semicircle of the wound structure, and the connection points between the second electrode sheet 12 and each second inner tab 32 all correspond to the second portion 2112. Here, the connection points between each first inner tab 31 and the first outer tab 41s correspond to the second portion 2112. Here, the connection point of the second inner tab 32 to the second outer tab 42s corresponds to the second portion 2112.

[0050] In the semi-tab structure, the height difference h0 between the second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21 and the first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is 0.6 mm to 1.2 mm.

[0051] Preferably, in the semi-tab structure, the height difference h0 between the second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21 and the first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is 0.8 mm to 1.0 mm.

[0052] More preferably, in the semi-tab structure, the height difference h0 between the second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21 and the first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is 0.9 mm.

[0053] The term "semicircle" in the present embodiment refers to the structure that appears when the wound electrode assembly 1 is cross-sectioned. Here, the cross section refers to the plane where the second direction L2 and the thickness direction of the battery cell 100 are aligned.

[0054] Regarding the inner tab 3, the outer tab 4, and the wound electrode assembly 1, as shown in FIG. 7, in some embodiments, the inner tab 3, the outer tab 4, and the wound electrode assembly 1 form a semi-full tab structure. In one implementation of the semi-full tab structure, every half-circle of the first electrode sheet 11 is connected to the first end of a first inner tab 31. Two connection points where the first electrode sheet 11 is connected to the first inner tab 31 are respectively distributed within two semicircles of the wound structure. Here, one semicircle of the wound structure corresponds to the first portion 2111, and the other semicircle of the wound structure corresponds to the second portion 2112. Every other circumference of the second electrode sheet 12 is connected to the first end of one second inner tab 32, and the connection points between the second electrode sheet 12 and the second inner tab 32 are both distributed within the same semicircle of the wound structure. Here, the connection points between each first inner tab 31 and the first outer tab 41s correspond to the second portion 2112. Here, the connection point of each second inner tab 32 to the second outer tab 42s corresponds to the second portion 2112.

[0055] Regarding the above-described inner tab 3, outer tab 4, and wound electrode assembly 1, in some embodiments, as shown in FIG. 8 , the inner tab 3, outer tab 4, and wound electrode assembly 1 form a semi-full tab structure. In another embodiment of the semi-full tab structure, every turn of the first electrode sheet 11 is connected to the first end of one first inner tab 31, and the connection points between the first electrode sheet 11 and the first inner tab 31 are all distributed within the same semicircle of the wound structure. Every half turn of the second electrode sheet 12 is connected to the first end of one second inner tab 32, and the two connection points between the second electrode sheet 12 and the second inner tab 32 are each distributed within two semicircles of the wound structure. Here, one semicircle of the wound structure corresponds to the first portion 2111, and the other semicircle of the wound structure corresponds to the second portion 2112. Here, the connection points between each first inner tab 31 and the first outer tab 41s correspond to the second portion 2112. The connection point of each second inner tab 32 to the second outer tab 42s corresponds to the second portion 2112.

[0056] Regarding the electrode assembly 1 having the inner tab 3, the outer tab 4, and the wound structure, in some embodiments, as shown in FIG. 9 , the inner tab 3, the outer tab 4, and the wound structure form a semi-full tab structure. In another embodiment of the semi-full tab structure, every turn of the first electrode sheet 11 is connected to the first end of one first inner tab 31, and the connection points between the first electrode sheet 11 and the first inner tab 31 are distributed within two semicircles of the wound structure. Every turn of the second electrode sheet 12 is connected to the first end of one second inner tab 32, and the connection points between the second electrode sheet 12 and the second inner tab 32 are distributed within two semicircles of the wound structure. Here, one semicircle of the wound structure corresponds to the first portion 2111, and the other semicircle of the wound structure corresponds to the second portion 2112. Here, the connection points between each first inner tab 31 and the first outer tab 41s correspond to the second portion 2112. Here, the connection point of each second inner tab 32 to the second outer tab 42s corresponds to the second portion 2112.

[0057] In the semi-full tab structure, the height difference h0 between the second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21 and the first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is 0.2 mm to 0.8 mm.

[0058] In some embodiments, in the semi-full tab structure, the height difference h0 between the second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21 and the first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is 0.4 mm to 0.6 mm.

[0059] Preferably, in the semi-full tab structure, the height difference h0 between the second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21 and the first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is 0.5 mm.

[0060] In the semi-full tab structure, the connection points between the first inner tab 31 and the first electrode sheet 11 or the connection points between the second inner tab 32 and the second electrode sheet 12 are distributed within two semicircles, so when the second end of the first inner tab 31 is connected to the first outer tab 41s or when the second end of the second inner tab 32 is connected to the second outer tab 42s, it always occupies the storage space corresponding to the first portion 2111 of the packaging bag 2. Therefore, in the semi-full tab structure, the height difference h0 between the second height h2 and the first height h1 is smaller than h0 in the semi-tab structure.

[0061] Regarding the inner tab 3, the outer tab 4, and the wound electrode assembly 1, in some embodiments, as shown in FIG. 10 , the inner tab 3, the outer tab 4, and the wound electrode assembly 1 form a full-tab structure. In the full-tab structure, every half circumference of the first electrode sheet 11 is connected to the first end of one first inner tab 31, and the two connection points between the first electrode sheet 11 and the first inner tab 31 are respectively distributed within two semicircles of the wound structure. Every half circumference of the second electrode sheet 12 is connected to the first end of one second inner tab 32, and the two connection points between the second electrode sheet 12 and the second inner tab 32 are respectively distributed within two semicircles of the wound structure. Here, one semicircle of the wound structure corresponds to the first portion 2111, and the other semicircle of the wound structure corresponds to the second portion 2112. Here, the connection points between each first inner tab 31 and the first outer tab 41s correspond to the second portion 2112. Here, the connection point of each second inner tab 32 to the second outer tab 42s corresponds to the second portion 2112.

[0062] In all tab structures, the height difference h0 between the second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21 and the first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is 0.2 mm to 0.8 mm.

[0063] Preferably, in the entire tab structure, the height difference h0 between the second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21 and the first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is 0.5 mm.

[0064] Furthermore, with regard to the above-mentioned inner tab 3, outer tab 4, and wound electrode assembly 1, regardless of the structure between the inner tab 3, outer tab 4, and wound electrode assembly 1, i.e., regardless of how the inner tab 3 and the electrode assembly 1 are connected, as long as it is ensured that the second height h2 corresponding to the second portion 2112 of the packaging bag 2 is smaller than the first height h1 corresponding to the first portion 2111, the space 2a outside the packaging bag 2, defined between the second portion 2112 and the first portion 2111, can be used for external power-using equipment, thereby expanding the range of applications of the battery cell 100.

[0065] In some embodiments, the inner tab 3 includes a plurality of first inner tabs 31 and a plurality of second inner tabs 32 to prevent the first electrode sheet 11 and the second electrode sheet 12 from contacting each other and shorting at the connection point between the first inner tab 31 and the first electrode sheet 11 or the connection point between the second inner tab 32 and the second electrode sheet 12. As shown in FIGS. 5 and 6 , the battery cell 100 further includes a plurality of first insulating rubber pieces 5 and a plurality of second insulating rubber pieces 6. Both ends of one first insulating rubber piece 5 are attached to one surface of a first end of one first inner tab 31 and the surface of the material layer of the first electrode sheet 11, respectively, and / or both ends of one second insulating rubber piece 6 are attached to one surface of a first end of one second inner tab 32 and the surface of the material layer of the second electrode sheet 12, respectively.

[0066] Here, one surface of the first end of the first inner tab 31 and the surface of the material layer of the first electrode sheet 11 are located on the same side of the first electrode sheet 11 .

[0067] Here, one surface of the first end of the second inner tab 32 and the surface of the material layer of the second electrode sheet 12 are located on the same side of the second electrode sheet 12 .

[0068] Regarding the outer tab 4 described above, in some embodiments, the outer tab 4 includes a first outer tab 41s and a second outer tab 42s. Here, both the first outer tab 41s and the second outer tab 42s protrude from the hem 22 of the packaging bag 2 to the outside of the packaging bag 2. In some embodiments, as shown in FIGS. 5 and 6 , the battery cell 100 further includes a first tab rubber 7 for sealing the connection point between the first outer tab 41s and the hem 22, and a second tab rubber 8 for sealing the connection point between the second outer tab 42s and the hem 22. This makes it less likely that the electrolyte in the battery cell 100 will leak from the connection point between the first outer tab 41s and the packaging bag 2 or the connection point between the second outer tab 42s and the packaging bag 2.

[0069] Regarding the inner tab 3 and the outer tab 4, the second end of the inner tab 3 is connected to the connecting portion 41 of the outer tab 4 after being folded. In some embodiments, the second end of the inner tab 3 is close to the packaging bag 2, or the connecting portion 41 of the outer tab 4 is close to the packaging bag 2. To insulate the second end of the inner tab 3 or the connecting portion 41 of the outer tab 4 from the packaging bag 2, as shown in FIG. 2 , a third insulating rubber 9 is typically provided between the second end of the inner tab 3 and the packaging bag 2, or between the connecting portion 41 of the outer tab 4 and the packaging bag 2. When the second end of the inner tab 3 approaches the packaging bag 2, the third insulating rubber 9 is adhered to the second end of the inner tab 3 and the packaging bag 2, respectively. When the connecting portion 41 of the outer tab 4 approaches the packaging bag 2, the third insulating rubber 9 is adhered to the connecting portion 41 of the outer tab 4 and the packaging bag 2.

[0070] In the present embodiment, the battery cell 100 includes an electrode assembly 1, a packaging bag 2, an inner tab 3, and an outer tab 4. The packaging bag 2 includes a main body 21 and a border 22. The electrode assembly 1 is housed in the main body 21, the inner tab 3 is connected to the electrode assembly 1 and the outer tab 4, respectively, the border 22 is connected to a top wall 211 of the main body 21, and the outer tab 4 protrudes from the border 22 to the outside of the packaging bag 2. In the thickness direction L3 of the battery cell 100, the top wall 211 includes a first portion 2111 and a second portion 2112 located on either side of the border 22. Here, a first height h1 from the first portion 2111 to the bottom wall 212 of the main body 21 is smaller than a second height h2 from the second portion 2112 to the bottom wall 212 of the main body 21. By setting the first height h1 corresponding to the first portion 2111 of the edging 22 of the packaging bag 2 smaller than the second height h2 corresponding to the second portion 2112 of the edging 22, it is possible to position at least a portion of the inner tab 3 and the connection point between the inner tab 3 and the outer tab 4 so that they correspond to the second portion 2112. This reduces the overall dimensions of the battery cell 100, and the space 2a left between the second portion 2112 and the first portion 2111 outside the packaging bag 2 of the battery cell 100 can be used for external electronic equipment, further reducing the overall dimensions of the electronic equipment and expanding the range of applications of the battery cell 100.

[0071] The present embodiment also provides an embodiment of a power-using equipment including a load and the above-described battery cell 100. The battery cell 100 is electrically connected to the load and supplies power to the load.

[0072] The electrical equipment may be an energy storage product, a mobile phone, a tablet, a drone, a one-wheeled or two-wheeled or more electric vehicle, or an electric cleaning tool.

[0073] For example, with respect to the drone, the battery pack is mounted on the drone and is used to power loads including the flight system, control system, and imaging system of the drone.

[0074] The specification and drawings of this application illustrate preferred embodiments of the present application. However, the present invention is not limited to the embodiments described herein and may be realized in many different forms. These embodiments are intended to provide a more complete understanding of the disclosure of this application and are not intended to further limit the content of this application. In addition, various embodiments not listed above formed by combining the above technical features all fall within the scope described in this specification. Furthermore, any improvements or modifications made by those skilled in the art based on the above description should fall within the scope of the claims attached to this application.

Claims

1. an electrode assembly, a packaging bag, an inner tab, and an outer tab; the packaging bag includes a main body and a border, and the electrode assembly and the inner tab are both housed in the main body; a battery cell, wherein a first end of the inner tab is connected to the electrode assembly, and a second end of the inner tab is connected to one end of the outer tab; the edging portion is connected to the top wall of the main body portion, and the other end of the outer tab extends beyond the edging portion to the outside of the packaging bag; the top wall includes a first portion and a second portion located on either side of the border in a thickness direction of the battery cell; wherein a first height from the first portion to the bottom wall of the main body is smaller than a second height from the second portion to the bottom wall of the main body; the electrode assembly includes a first electrode sheet, a second electrode sheet, and a separator positioned between the first electrode sheet and the second electrode sheet; the first electrode sheet, the separator, and the second electrode sheet are wound together to form a wound structure; the inner tabs include a plurality of first inner tabs and a plurality of second inner tabs, and the outer tabs include a first outer tab and a second outer tab; First ends of the first inner tabs are connected to a first electrode sheet, and second ends of the first inner tabs are connected to a first outer tab; First ends of the second inner tabs are connected to a second electrode sheet, and second ends of the second inner tabs are connected to a second outer tab, and the second outer tab extends from the edging portion to an outside of the packaging bag. each of the first electrode sheets is connected to a first end of one of the first inner tabs, and connection points between the first electrode sheet and each of the first inner tabs are located on the same semicircle of the wound structure, and connection points between the first electrode sheet and each of the first inner tabs correspond to the second portion; and / or a second inner tab connected to the first end of the second electrode sheet, the second inner tabs being connected to the first end of the second inner tab, the second inner tabs being connected to the first end of the second inner tab, and the second inner tabs being connected to the first end of the second inner tab.

2. The outer tab includes a connecting portion and an extending portion that is bent from the connecting portion and extends outward from the edging portion, the connecting portion corresponds to the second portion; 2. The battery cell according to claim 1, wherein the second end of the inner tab extends toward the second portion and is bent from a position close to the second portion toward the first portion, and the second end of the inner tab is connected to the connecting portion after being bent.

3. The battery cell according to claim 1, wherein the height difference between the second height and the first height is 0.6 mm to 1.2 mm.

4. Each half circumference of the first electrode sheet is connected to a first end of one of the first inner tabs, two connection points between each circumference of the first electrode sheet and the first inner tab are respectively distributed within two semicircles of the winding structure; wherein one semicircle of the winding structure corresponds to the first portion, and the other semicircle of the winding structure corresponds to the second portion; Each periphery of the second electrode sheet is connected to a first end of one of the second inner tabs; The battery cell according to claim 1 , wherein the connection points between the second electrode sheet and each of the second inner tabs are all distributed within the same semicircle of the wound structure.

5. The battery cell according to claim 4, wherein the height difference between the second height and the first height is 0.2 mm to 0.8 mm.

6. Further including a plurality of first insulating rubbers and a plurality of second insulating rubbers, both ends of one of the first insulating rubbers are attached to one surface of the first end of one of the first inner tabs and to a surface of the material layer of the first electrode sheet, respectively; and / or The battery cell according to any one of claims 1 to 4, wherein both ends of one of the second insulating rubbers are attached to one surface of the first end of one of the second inner tabs and to the surface of the material layer of the second electrode sheet, respectively.

7. Further comprising a first tab rubber and a second tab rubber, the first tab rubber is used to seal the connection between the first outer tab and the edging portion; 5. The battery cell according to claim 1, wherein the second tab rubber is used to seal a connection point between the second outer tab and the edging portion.

8. the outer tab includes a connecting portion that corresponds to the second portion and that is disposed so as to extend along the second portion toward the first portion, and an extending portion that is bent from the connecting portion and that protrudes outside the edging portion, a second end of the inner tab extending toward the second portion and bent toward the first portion from a location adjacent to the second portion; The battery cell according to claim 1 , wherein the second end of the inner tab is bent and then connected to the connecting portion.

9. An electric power-using facility, 9. An electric power consumption facility comprising: a load; and the battery cell according to claim 1, wherein the load and the battery cell are electrically connected.

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