Battery cell and battery

Abstract

A battery cell (100) and a battery. The battery cell (100) comprises a main body (110), a first conductive member (120), and a second conductive member (130); the main body (110) is formed by winding a first electrode sheet (111) and a second electrode sheet (112); the main body (110) has, in the thickness direction, a first surface (113) and a second surface (114) which are opposite to each other, and a middle layer (115); the first conductive member (120) is formed by stacking and connecting a plurality of first dummy tabs (121) connected to the first electrode sheet (111); the second conductive member (130) is formed by stacking and connecting a plurality of second dummy tabs (131) connected to the first electrode sheet (111); the first conductive member (120) is located between the middle layer (115) and the first surface (113), and is bent toward one side of the second surface (114); the second conductive member (130) is located between the middle layer (115) and the second surface (114), and is bent toward one side of the first surface (113); and the bent first conductive member (120) and the bent second conductive member (130) are both located between the first surface (113) and the second surface (114), thereby reducing the space occupied by the first conductive member (120) and the second conductive member (130) in a case of the battery, and improving the energy density of the battery.

Description

Battery cell and battery TECHNICAL FIELD

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

[0002] Soft package lithium ion batteries are widely used in various digital products and mobile devices. Some battery cells use false tabs to improve charging speed. When the battery cell is installed in the shell of the battery, the battery cell occupies a large space in the shell, affecting the energy density of the battery.

[0003] SUMMARY

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

[0005] The battery cell according to the first aspect of the present application comprises a main body, a first conductive member and a second conductive member. The main body is formed by winding a first tab and a second tab. The main body has opposite first and second surfaces along the thickness direction, and has an intermediate layer between the first and second surfaces. The first conductive member is formed by stacking and connecting a plurality of first false tabs. The plurality of first false tabs are connected to the first tab. The second conductive member is formed by stacking and connecting a plurality of second false tabs. The plurality of second false tabs are connected to the first tab. The first conductive member is located between the intermediate layer and the first surface, and is bent towards one side of the second surface. The second conductive member is located between the intermediate layer and the second surface, and is bent towards one side of the first surface. The bent first conductive member and the bent second conductive member are both located between the first and second surfaces.

[0006] The battery cell according to the embodiments of this application has at least the following beneficial effects: the first conductive element is formed by stacking and connecting multiple first dummy tabs connected to the first electrode, and the second conductive element is formed by stacking and connecting multiple second dummy tabs connected to the first electrode. The first and second conductive elements can improve the current distribution, improve the cycle life of the battery, and enhance the battery's safety. The first conductive element is located between the intermediate layer and the first surface of the main body and is bent towards one side of the second surface. The second conductive element is located between the intermediate layer and the second surface of the main body and is bent towards one side of the first surface. Thus, when the battery cell is assembled into the battery casing, the lengths of the bent first and second conductive elements are shortened, reducing the space occupied by the first and second conductive elements within the battery casing. This allows the battery casing to accommodate a larger main body, which helps to improve the battery's energy density. Both the bent first conductive element and the bent second conductive element are located between the first surface and the second surface. In this way, the bent first conductive element and the bent second conductive element can be controlled at the end face of the main body, without crossing the first surface and the second surface in the thickness direction. This helps to avoid the bent first conductive element and the bent second conductive element affecting the thickness dimension of the battery cell.

[0007] According to some embodiments of this application, the battery cell further includes a first tab and a second tab, the first tab being connected to a first electrode plate and the second tab being connected to a second electrode plate; the main body has a first end and a second end opposite to each other, the first tab and the second tab both protruding from the first end, and the first conductive element and the second conductive element both protruding from the first end or the second end.

[0008] According to some embodiments of this application, the first electrode is a negative electrode and the second electrode is a positive electrode.

[0009] According to some embodiments of this application, the first electrode includes a plurality of alternating first segments and a plurality of second segments, each first segment being connected to a first dummy electrode tab; the first segments and second segments are alternately distributed along the winding direction of the first electrode, and the plurality of first dummy electrode tabs overlap along the thickness direction.

[0010] According to some embodiments of this application, each second segment is connected to a second dummy electrode tab, and multiple second dummy electrodes tabs overlap along the thickness direction.

[0011] According to some embodiments of this application, the first electrode includes a first empty foil region, a first current collector region and a second empty foil region connected in sequence, and a plurality of first dummy electrodes are all connected to the first current collector region.

[0012] According to some embodiments of this application, the second electrode includes a third empty foil region, a second current collector region, and a fourth empty foil region connected in sequence, and a plurality of second dummy electrodes are all connected to the second current collector region.

[0013] According to some embodiments of the present application, the first tab includes a first empty foil region, a first current collecting region and a second empty foil region connected in sequence, and at least one of the first empty foil region, the first current collecting region and the second empty foil region is connected with at least one first tab lug; the second tab includes a third empty foil region, a second current collecting region and a fourth empty foil region connected in sequence, and at least one of the third empty foil region, the second current collecting region and the fourth empty foil region is connected with at least one second tab lug.

[0014] According to some embodiments of the present application, the first conductive member is bonded to the main body, and / or the second conductive member is bonded to the main body.

[0015] According to the battery of the second aspect embodiments of the present application, the battery includes the battery cell in any of the above embodiments.

[0016] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described with reference to the drawings and embodiments, wherein:

[0018] Fig. 1 shows a structural schematic diagram of a battery cell provided by embodiments of the present application.

[0019] Fig. 2 shows a structural schematic diagram of a first conductive member and a second conductive member provided by embodiments of the present application.

[0020] Fig. 3 shows a structural schematic diagram of a first tab, a first dummy tab and a first tab lug provided by embodiments of the present application.

[0021] Fig. 4 shows a structural schematic diagram of a second tab, a second dummy tab and a second tab lug provided by embodiments of the present application.

[0022] Reference signs:

[0023] Battery cell 100;

[0024] Main body 110; first surface 113; second surface 114; intermediate layer 115; first end 116; second end 117;

[0025] First tab 111; first section 1111; second section 1112; first empty foil region 1113; first current collecting region 1114; second empty foil region 1115;

[0026] Second tab 112; third empty foil region 1121; second current collecting region 1122; fourth empty foil region 1123;

[0027] First conductive member 120; first dummy tab 121;

[0028] The second conductive member 130; the second dummy tab 131;

[0029] The first tab 140; the second tab 150. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the purpose of describing the present application and simplifying the description, and is not intended to 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 present application.

[0032] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. is not included in the number, above, below, etc. is understood to include the number. If it is described that the first, second is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0033] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0034] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Please refer to FIG. 1, the present application provides a battery, the battery comprises a shell and a battery cell 100, the battery cell 100 can be arranged in the shell, and the shell can be injected with electrolyte to form a battery.

[0036] Referring to FIGS. 1-4, in some embodiments, the battery cell 100 includes a main body 110, a first conductive member 120, and a second conductive member 130.

[0037] As shown in FIGS. 3 and 4, the main body 110 is formed by winding the first tab 111 and the second tab 112. For example, the main body 110 can further include a separator for separating the first tab 111 and the second tab 112, and the first tab 111, the separator, and the second tab 112 can be sequentially stacked and then wound.

[0038] As shown in FIGS. 1 and 2, the main body 110 has opposite first and second surfaces 113 and 114 in a thickness direction, and has an intermediate layer 115 between the first and second surfaces 113 and 114.

[0039] The intermediate layer 115 can refer to the innermost layer after winding of the first tab 111 or the second tab 112. For example, the intermediate layer 115 can refer to the innermost layer of the first tab 111 after winding, or the intermediate layer 115 can refer to the innermost layer of the second tab 112 after winding, which can be distinguished according to actual conditions.

[0040] As shown in FIGS. 2 and 3, the first conductive member 120 is formed by stacking and connecting a plurality of first dummy tabs 121, and the plurality of first dummy tabs 121 are connected to the first tab 111. The first conductive member 120 formed by connecting the plurality of first dummy tabs 121 can improve the distribution of current, which can help to uniformly distribute current, reduce local overheating or overcharging in the battery cell 100, improve the cycle life of the battery, and improve the safety of the battery. For example, the first conductive member 120 can be formed by stacking and welding the plurality of first dummy tabs 121.

[0041] The second conductive member 130 is formed by stacking and connecting a plurality of second dummy tabs 131, and the plurality of second dummy tabs 131 are connected to the first tab 111. The first conductive member 120 and the second conductive member 130 can further improve the distribution of current, which can further improve the cycle life of the battery and the safety of the battery. For example, the second conductive member 130 can be formed by stacking and welding the plurality of second dummy tabs 131.

[0042] The first conductive member 120 is located between the intermediate layer 115 and the first surface 113 and is bent to one side of the second surface 114, and the second conductive member 130 is located between the intermediate layer 115 and the second surface 114 and is bent to one side of the first surface 113. In this way, when the battery cell 100 is assembled in the shell of the battery, the length of the bent first conductive member 120 and the length of the bent second conductive member 130 are shortened, which helps to increase the size of the main body 110, reduces the space occupied by the first conductive member 120 and the second conductive member 130 in the shell of the battery, so that the shell of the battery can accommodate a larger size of the main body 110, which helps to improve the energy density of the battery. Moreover, since the plurality of first dummy tabs 121 are only arranged between the intermediate layer 115 and the first surface 113, the intermediate layer 115 and the second surface 114 can have sufficient space so that the first conductive member 120 can be bent. Similarly, since the plurality of second dummy tabs 131 are only arranged between the intermediate layer 115 and the second surface 114, the intermediate layer 115 and the first surface 113 can have sufficient space so that the first conductive member 120 can be bent.

[0043] The bending of the first conductive member 120 to one side of the second surface 114 can mean that the first conductive member 120 is bent to one side of the second surface 114 and is in a bent state.

[0044] The bending of the second conductive member 130 to one side of the first surface 113 can mean that the first conductive member 120 is bent to one side of the first surface 113 and is in a bent state.

[0045] The first conductive member 120 can mean that, after the first and second electrode sheets 111 and 112 are wound, the first conductive member 120 is formed by connecting the plurality of first dummy tabs 121 connected to the first electrode sheet 111 between the intermediate layer 115 and the first surface 113. It should be noted that the first electrode sheet 111 located between the intermediate layer 115 and the first surface 113 can have the first dummy tab 121 connected to each layer of the first electrode sheet 111, or some layers of the first electrode sheet 111 can have the first dummy tab 121 connected.

[0046] Similarly, the second conductive member 130 can mean that, after the first and second electrode sheets 111 and 112 are wound, the second conductive member 130 is formed by connecting the plurality of second dummy tabs 131 connected to the first electrode sheet 111 between the intermediate layer 115 and the second surface 114. It should be noted that the first electrode sheet 111 located between the intermediate layer 115 and the second surface 114 can have the second dummy tab 131 connected to each layer of the first electrode sheet 111, or some layers of the first electrode sheet 111 can have the second dummy tab 131 connected.

[0047] The first conductive member 120 after being bent is located between the first surface 113 and the second surface 114, and the second conductive member 130 after being bent is located between the first surface 113 and the second surface 114. In this way, the first conductive member 120 after being bent and the second conductive member 130 after being bent can be controlled at the end surface of the main body 110 without exceeding the first surface 113 and the second surface 114 in the thickness direction, which helps to avoid the first conductive member 120 after being bent and the second conductive member 130 after being bent affecting the thickness dimension of the battery cell 100.

[0048] Referring to FIG. 2, in some embodiments, the lengths of the plurality of first dummy tabs 121 can be equal or unequal after the first conductive member 120 is bent without exceeding the second surface 114. Similarly, the lengths of the plurality of second dummy tabs 131 can be equal or unequal after the second conductive member 130 is bent without exceeding the first surface 113.

[0049] In some embodiments, the lengths of the plurality of first dummy tabs 121 can gradually decrease in the direction from the first surface 113 to the middle layer 115 after the first tab 111 and the second tab 112 are wound to form the main body 110, and the length of the longest one of the plurality of first dummy tabs 121 can be less than or equal to the thickness of the main body 110, so that the first conductive member 120 after being bent can not exceed the second surface 114.

[0050] Similarly, the lengths of the plurality of second dummy tabs 131 can gradually decrease in the direction from the second surface 114 to the middle layer 115 after the first tab 111 and the second tab 112 are wound to form the main body 110, and the length of the longest one of the plurality of second dummy tabs 131 can be less than or equal to the thickness of the main body 110, so that the second conductive member 130 after being bent can not exceed the first surface 113.

[0051] The thickness of the main body 110 can refer to the thickness of the main body 110 in the direction from the first surface 113 to the second surface 114.

[0052] Referring to FIGS. 1, 3 and 4, in some embodiments, the battery cell 100 can further include a first tab 140 and a second tab 150. The first tab 140 can be connected to the first tab 111, and the second tab 150 can be connected to the second tab 112. The first tab 140 and the second tab 150 can interact with the outside world to perform charging and discharging.

[0053] In some embodiments, the first tab 111 can be a negative tab, and the second tab 112 can be a positive tab. In this way, the plurality of first false tabs 121 and the plurality of second false tabs 131 disposed on the first tab 111 can help improve the charging speed of the battery. It can be understood that the first tab 140 can be a negative tab, and the second tab 150 can be a positive tab.

[0054] Referring to FIG. 1, in some embodiments, the main body 110 can have a first end 116 and a second end 117 opposite to each other. The first tab 140 and the second tab 150 can be protruded from the first end 116, and the first conductive part 120 and the second conductive part 130 can be protruded from the second end 117. In this way, compared with the case where the tabs (the first tab 140 and the second tab 150) and the conductive parts (the first conductive part 120 and the second conductive part 130) are disposed on the same end of the main body 110, the present embodiment can help reduce the manufacturing difficulty of the shell of the battery, and also help the cell 100 to be more easily installed into the shell of the battery.

[0055] The first conductive part 120 and the second conductive part 130 can also be protruded from the first end 117. That is, the first tab 140, the second tab 150, the first conductive part 120, and the second conductive part 130 can be protruded from the first end 116. In this way, the distance between the tabs and the conductive parts can be shortened, which can help improve the shunt effect of the first conductive part 120 and the second conductive part 130.

[0056] The direction from the first end 116 to the second end 117 is substantially the length direction of the cell 100.

[0057] Referring to FIG. 1 and FIG. 3, in some embodiments, the first tab 111 can include a plurality of first segments 1111 and a plurality of second segments 1112 connected alternately. Each first segment 1111 can be connected with one first false tab 121. The first segments 1111 and the second segments 1112 can be distributed alternately along the winding direction of the first tab 111. The plurality of first false tabs 121 can overlap along the thickness direction. In this way, the plurality of first false tabs 121 can be controlled to be between the middle layer 115 and the first surface 113. The plurality of first false tabs 121 can be connected to form the first conductive part 120. The first conductive part 120 can be bent to the side of the second surface 114. The bent first conductive part 120 can not exceed the second surface 114. The thickness direction can refer to the thickness direction of the main body 110.

[0058] In some embodiments, each second segment 1112 is connected with one second dummy tab 131, and when the first tab 111 and the second tab 112 are wound, the plurality of second dummy tabs 131 overlap in the thickness direction, so that the plurality of second dummy tabs 131 can be controlled between the middle layer 115 and the second surface 114, and the plurality of second dummy tabs 131 are connected to form a second conductive member 130, and the second conductive member 130 can be bent to the first surface 113 side, and the bent second conductive member 130 can not exceed the second surface 114.

[0059] And since the first dummy tab 121 is connected to the first segment 1111, and the second dummy tab 131 is connected to the second segment 1112, and the first segment 1111 and the second segment 1112 are alternately distributed, so that the first dummy tab 121 and the second dummy tab 131 do not overlap in the thickness direction of the battery cell 100, that is, the first conductive member 120 and the second conductive member 130 can be distributed in the width direction of the battery cell 100. The width of the battery cell 100 is substantially in the direction from the first conductive member 120 to the second conductive member 130 in FIG. 1.

[0060] In some embodiments, the first tab 140 or the second tab 150 can be located in the same first segment 1111 as a first dummy tab 121, so as to shorten the distance between the first tab 140 or the second tab 150 and the first conductive member 120, and help to improve the shunt effect of the first conductive member 120.

[0061] Similarly, the first tab 140 or the second tab 150 can be located in the same second segment 1112 as a second dummy tab 121, so as to shorten the distance between the first tab 140 or the second tab 150 and the second conductive member 130, and improve the shunt effect of the second conductive member 130.

[0062] In some embodiments, the first tab 111 can include a first empty foil region 1113, a first current collecting region 1114 and a second empty foil region 1115 connected in sequence, and the plurality of first dummy tabs 121 are connected to the first current collecting region 1114, so as to improve the uniform current distribution performance of the first conductive member 120.

[0063] Among them, the first current collecting region 1114 can refer to the region on the first tab 111 which is coated with an active coating, and the first empty foil region 1113 and the second empty foil region 1115 can be located on the opposite sides of the first current collecting region 1114, respectively, and the first empty foil region 1113 and the second empty foil region 1115 can refer to the region on the first tab 111 which is not coated with an active coating.

[0064] It can be understood that the first current collecting region 1114 can include the plurality of first segments 1111 and the plurality of second segments 1112 alternately connected in the above embodiments.

[0065] In some embodiments, at least one of the first empty foil area 1113, the first current collecting area 1114 and the second empty foil area 1115 is connected with at least one first tab 140. In this way, the first tab 140 can have various arrangements, and the number of the first tab 140 can be one or more. When the number of the first tab 140 is more, the multiple first tabs 140 can further improve the distribution of the current, help to distribute the current uniformly, reduce the local overheating or overcharging in the battery cell 100, improve the cycle life of the battery, and improve the safety of the battery.

[0066] Specifically, at least one of the first empty foil area 1113, the first current collecting area 1114 and the second empty foil area 1115 is connected with the first tab 140, and each of the first empty foil area 1113, the first current collecting area 1114 and the second empty foil area 1115 can be connected with one or more first tabs 140. Wherein, “multiple” can refer to two or more.

[0067] As an example, the first empty foil area 1113 can be connected with one or more first tabs 140, the first current collecting area 1114 can be connected with one or more first tabs 140, and the second empty foil area 1115 can be connected with one or more first tabs 140.

[0068] As another example, the first empty foil area 1113 can be connected with one or more first tabs 140, the first current collecting area 1114 can be connected with one or more first tabs 140, and the second empty foil area 1115 can not be provided with the first tab 140.

[0069] As another example, the first empty foil area 1113 can be connected with one or more first tabs 140, the first current collecting area 1114 can not be provided with the first tab 140, and the second empty foil area 1115 can be connected with one or more first tabs 140.

[0070] As another example, the first empty foil area 1113 can not be provided with the first tab 140, the first current collecting area 1114 can be connected with one or more first tabs 140, and the second empty foil area 1115 can be connected with one or more first tabs 140.

[0071] As another example, the first empty foil area 1113 can be connected with one or more first tabs 140, the first current collecting area 1114 can not be provided with the first tab 140, and the second empty foil area 1115 can not be provided with the first tab 140.

[0072] Alternatively, the first tab 140 can also have other arrangements on the empty foil area 1113, the first current collecting area 1114 and the second empty foil area 1115, which will not be described herein.

[0073] Referring to FIG. 1 and FIG. 4, in some embodiments, the second tab 112 can include a third foil-free area 1121, a second current collecting area 1122, and a fourth foil-free area 1123 connected in sequence, and a plurality of second dummy tabs 131 are connected to the second current collecting area 1122 to improve the performance of the second conductive member 130 in uniform current distribution.

[0074] In some embodiments, the second current collecting area 1122 can refer to an area on the second tab 112 coated with an active coating, and the third foil-free area 1121 and the fourth foil-free area 1123 can be located on opposite sides of the second current collecting area 1122, respectively. The third foil-free area 1121 and the fourth foil-free area 1123 can refer to areas on the first tab 111 that are not coated with an active coating.

[0075] In some embodiments, the second tab 112 includes a third foil-free area 1121, a second current collecting area 1122, and a fourth foil-free area 1123 connected in sequence, and at least one of the third foil-free area 1121, the second current collecting area 1122, and the fourth foil-free area 1123 is connected to at least one second tab 150. In this way, the second tab 150 can have multiple settings, and the number of second tabs 150 can be one or more. When the number of second tabs 150 is more than one, the plurality of second tabs 150 can improve the distribution of current, help to distribute current uniformly, reduce the situation of local overheating or overcharging in the battery cell 100, improve the cycle life of the battery, and improve the safety of the battery.

[0076] Specifically, at least one of the third foil-free area 1121, the second current collecting area 1122, and the fourth foil-free area 1123 is connected to the second tab 150, and each of the third foil-free area 1121, the second current collecting area 1122, and the fourth foil-free area 1123 can be connected to one or more second tabs 150. Wherein, "a plurality of" can refer to two or more than two.

[0077] The setting of the second tab 150 in the third foil-free area 1121, the second current collecting area 1122, and the fourth foil-free area 1123 can refer to the setting of the first tab 140 in the first foil-free area 1113, the first current collecting area 1114, and the second foil-free area 1115, which will not be repeated here.

[0078] In some embodiments, the first conductive member 120 can be bonded to the main body 110, which helps the first conductive member 120 to remain in a bent state and reduces the rebounding of the first conductive member 120 after bending, so that the battery cell 100 can be more conveniently installed in the shell of the battery.

[0079] As an example, the first conductive member 120 can be adhered to the main body 110 by adhesive tape, for example, the adhesive tape can be wrapped on the outer surface of the first conductive member 120 after being bent, so as to be adhered to the main body 110 by the adhesive tape.

[0080] As another example, the surface of the first conductive member 120 can be provided with an adhesive layer, when the first conductive member 120 is bent, the first conductive member 120 can be adhered to the main body 110 by the adhesive layer, wherein the adhesive layer can be insulating glue or insulating double-sided adhesive tape.

[0081] Alternatively, the first conductive member 120 can also be adhered or connected to the main body 110 by other means.

[0082] Please refer to FIG. 1, in some embodiments, the second conductive member 130 is adhered to the main body 110, which helps the second conductive member 130 to remain in the bent state, reduces the rebounding of the second conductive member 130 after being bent, so that the battery cell 100 can be more conveniently installed in the shell of the battery.

[0083] Wherein, the adhering manner between the second conductive member 130 and the main body 110 can refer to the adhering manner between the first conductive member 120 and the main body 110, which will not be repeated here.

[0084] The battery cell 100 and the battery provided by the embodiments of the present application, the first conductive member 120 is formed by a plurality of first dummy tabs 121 connected to the first pole piece 111 in a stacked manner, and the second conductive member 130 is formed by a plurality of second dummy tabs 131 connected to the first pole piece 111 in a stacked manner, the first conductive member 120 and the second conductive member 130 can improve the distribution of current, improve the cycle life of the battery and the safety of the battery. The first conductive member 120 is located between the middle layer 115 and the first surface 113 of the main body 110 and is bent to one side of the second surface 114, and the second conductive member 130 is located between the middle layer 115 and the second surface 114 of the main body 110 and is bent to one side of the first surface 113, so that when the battery cell 100 is assembled in the shell of the battery, the length of the first conductive member 120 after being bent and the length of the second conductive member 130 after being bent are shortened, which can reduce the space occupied by the first conductive member 120 and the second conductive member 130 in the shell of the battery, so that the shell of the battery can accommodate a larger size of the main body 110, which helps to improve the energy density of the battery. The first conductive member 120 after being bent and the second conductive member after being bent are located between the first surface 113 and the second surface 114, so that the first conductive member 120 after being bent and the second conductive member 130 after being bent can be controlled on the end surface of the main body 110, without crossing the first surface 113 and the second surface 114 in the thickness direction, which helps to avoid the influence of the first conductive member 120 after being bent and the second conductive member 130 after being bent on the thickness size of the battery cell 100.

[0085] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application. Furthermore, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. An electric cell, characterized by, The battery cell comprises: a body wound by a first tab and a second tab, the body having opposite first and second surfaces along a thickness direction, and having an intermediate layer between the first and second surfaces; a first conductive member formed by a plurality of first dummy tabs connected in layers, the plurality of first dummy tabs connected to the first tab; a second conductive member formed by a plurality of second dummy tabs connected in layers, the plurality of second dummy tabs connected to the first tab; wherein the first conductive member is located between the intermediate layer and the first surface, and is bent to one side of the second surface; and the second conductive member is located between the intermediate layer and the second surface, and is bent to one side of the first surface; the first conductive member after being bent and the second conductive member after being bent are both located between the first and second surfaces. The battery cell further comprises a first tab and a second tab, the first tab connected to the first tab, and the second tab connected to the second tab; 2. The electric cell of claim 1, wherein, the body has opposite first and second ends, the first and second tabs both protruding from the first end, and the first and second conductive members both protruding from the first end or the second end. The first tab is a negative tab, and the second tab is a positive tab.

3. The electric cell of claim 1, wherein, The first tab comprises a plurality of first segments and a plurality of second segments connected alternately, each first segment connected with one first dummy tab; 4. The electric cell of claim 1, wherein, the first and second segments are arranged alternately along a winding direction of the first tab, and the plurality of first dummy tabs overlap along the thickness direction. Each second segment is connected with one second dummy tab, and the plurality of second dummy tabs overlap along the thickness direction.

5. The electric cell of claim 4, wherein, The first tab comprises a first empty foil region, a first current collecting region, and a second empty foil region connected in sequence, and the plurality of first dummy tabs are all connected to the first current collecting region.

6. The electric cell of claim 1, wherein, The second tab comprises a third empty foil region, a second current collecting region, and a fourth empty foil region connected in sequence, and the plurality of second dummy tabs are all connected to the second current collecting region.

7. The electric cell of claim 1, wherein, The first tab comprises a first empty foil region, a first current collecting region, and a second empty foil region connected in sequence, and at least one of the first empty foil region, the first current collecting region, and the second empty foil region is connected with at least one first tab; 8. The electric cell of claim 2, wherein, The second tab comprises a third empty foil region, a second current collecting region, and a fourth empty foil region connected in sequence, and at least one of the third empty foil region, the second current collecting region, and the fourth empty foil region is connected with at least one second tab. The first conductive member is bonded to the body, and / or the second conductive member is bonded to the body.

9. The electric cell of claim 1, wherein, The battery cell according to any one of claims 1 to 9.

10. A battery, characterized by ​

Images